If $\varepsilon$ 1 = 4.0 V,$\varepsilon$ 2 = 12.0 V,R1 = 4 $\Omega$,R2 = 12 $\Omega$,C = 3 $\mu$F,Q = 18$\mu$C,and I = 2.5 A,what is the potential difference Va -Vb?

A) -30 V B) 30 V C) 5.0 V D) -5.0 V E) -1.0 V A) -30 V B) 30 V C) 5.0 V D) -5.0 V E) -1.0 V

The electron density in copper is 8.49 *1028 electrons/m3.The electron charge is e = -1.60 *10 - 19 C.When a 1.00 A current is present in a copper wire with a 0.40 cm2 cross-section,the electron drift velocity,in m/s,with direction defined relative to the current density,is

A) -1.84 *10 - 6. B) +1.84 * 10 - 6. C) -1.84. D) -5.43 * 10 - . E) +5.43 * 10 - . A) -1.84 *10 - 6. B) +1.84 * 10 - 6. C) -1.84. D) -5.43 * 10 - . E) +5.43 * 10 - .

Exam 21: Current and Direct Current Circuits

Determine the magnitude and sense (direction)of the current in the 500- $\Omega$ resistor when I = 30 mA. $Determine the magnitude and sense (direction)of the current in the 500- \Omega resistor when I = 30 mA.$

(Multiple Choice)

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Question 61

A parallel circuit consists of a 100 V DC power source,a 100 $\Omega$ resistor,and a variable resistor of resistance R,which varies from 0 to 100 $\Omega$ .The current in the circuit is $A parallel circuit consists of a 100 V DC power source,a 100 \Omega resistor,and a variable resistor of resistance R,which varies from 0 to 100 \Omega .The current in the circuit is$

(Multiple Choice)

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Question 62

What is the magnitude of the potential difference across the 20- $\Omega$ resistor? $What is the magnitude of the potential difference across the 20- \Omega resistor?$

(Multiple Choice)

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Question 63

If $\varepsilon$ ₁ = 4.0 V, $\varepsilon$ ₂ = 12.0 V,R₁ = 4 $\Omega$ ,R₂ = 12 $\Omega$ ,C = 3 $\mu$ F,Q = 18 $\mu$ C,and I = 2.5 A,what is the potential difference V_a -V_b? $If \varepsilon 1 = 4.0 V, \varepsilon 2 = 12.0 V,R1 = 4 \Omega ,R2 = 12 \Omega ,C = 3 \mu F,Q = 18 \mu C,and I = 2.5 A,what is the potential difference Va -Vb?$

(Multiple Choice)

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Question 64

What is the potential difference V_b - V_a shown in the circuit below.

(Multiple Choice)

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Question 65

Determine the magnitude and sense (direction)of the current in the 10- $\Omega$ resistor when I = 1.8 A. $Determine the magnitude and sense (direction)of the current in the 10- \Omega resistor when I = 1.8 A.$

(Multiple Choice)

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Question 66

If a mile of 24-gauge copper wire has a resistance of 0.14 k $\Omega$ and the resistivity of copper is 1.7 *10 ^- ⁸ $\Omega$ . m,what is the diameter of the wire? (1 mile = 1.6 km)

(Multiple Choice)

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Question 67

Most telephone cables are made of copper wire of either 24 or 26 gauge.If the resistance of 24-gauge wire is 137 $\Omega$ /mile and the resistance of 26-gauge wire is 220 $\Omega$ /mile,what is the ratio of the diameter of 24-gauge wire to that of 26-gauge wire?

(Multiple Choice)

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Question 68

A conductor of radius r,length $\ell$ and resistivity $\rho$ has resistance R.It is melted down and formed into a new conductor,also cylindrical,with one fourth the length of the original conductor.The resistance of the new conductor is

(Multiple Choice)

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Question 69

What is the maximum number of 100-W lightbulbs you can connect in parallel in a 120-V home circuit without tripping the 20-A circuit breaker?

(Short Answer)

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Question 70

What is the equivalent resistance between points a and b when R = 13 $\Omega$ ? $What is the equivalent resistance between points a and b when R = 13 \Omega ?$

(Multiple Choice)

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Question 71

Light bulb A is rated at 60 W and light bulb B is rated at 100 W.Both are designed to operate at 110 V.Which statement is correct?

(Multiple Choice)

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Question 72

How long will it take a charged 80- $\mu$ F capacitor to lose 20% of its initial energy when it is allowed to discharge through a 45- $\Omega$ resistor?

(Multiple Choice)

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Question 73

What is the equivalent resistance between points a and b when R = 30 $\Omega$ ? $What is the equivalent resistance between points a and b when R = 30 \Omega ?$

(Multiple Choice)

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Question 74

The electron density in copper is 8.49 10²⁸ electrons/m³.The electron charge is e = -1.60 10 ^- ¹⁹ C.When a 1.00 A current is present in a copper wire with a 0.40 cm² cross-section,the electron drift velocity,in m/s,with direction defined relative to the current density,is

(Multiple Choice)

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Question 75

Jadeen says that you can increase the resistance of a copper wire by hammering the wire to make it narrower and longer.Arnell says that you can increase its resistance by heating the wire.Which one,if either,is correct,and why?

(Multiple Choice)

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Question 76

In an RC circuit,how many time constants must elapse if an initially uncharged capacitor is to reach 80% of its final potential difference?

(Multiple Choice)

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Question 77

Determine the resistance R when I = 1.5 A.

(Multiple Choice)

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Question 78

A series circuit consists of a 100 V DC power source,a 100 $\Omega$ resistor,and a variable resistor of resistance R,which varies from 0 to 100 $\Omega$ .The current in the circuit is $A series circuit consists of a 100 V DC power source,a 100 \Omega resistor,and a variable resistor of resistance R,which varies from 0 to 100 \Omega .The current in the circuit is$

(Multiple Choice)

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Question 79

A high-voltage transmission line carries 1 000 A at 700 kV for a distance of 100 miles.If the resistance per length in the wire is 0.5 $\Omega$ /mile,what is the power loss due to resistive losses?

(Short Answer)

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Question 80

Showing 61 - 80 of 113

Exam 21: Current and Direct Current Circuits

Determine the magnitude and sense (direction)of the current in the 500- Ω\OmegaΩ resistor when I = 30 mA.

A parallel circuit consists of a 100 V DC power source,a 100 Ω\OmegaΩ resistor,and a variable resistor of resistance R,which varies from 0 to 100 Ω\OmegaΩ .The current in the circuit is

What is the magnitude of the potential difference across the 20- Ω\OmegaΩ resistor?

If ε\varepsilonε 1 = 4.0 V, ε\varepsilonε 2 = 12.0 V,R1 = 4 Ω\OmegaΩ ,R2 = 12 Ω\OmegaΩ ,C = 3 μ\muμ F,Q = 18 μ\muμ C,and I = 2.5 A,what is the potential difference Va -Vb?

What is the potential difference Vb - Va shown in the circuit below.

Determine the magnitude and sense (direction)of the current in the 10- Ω\OmegaΩ resistor when I = 1.8 A.

If a mile of 24-gauge copper wire has a resistance of 0.14 k Ω\OmegaΩ and the resistivity of copper is 1.7 *10 - 8 Ω\OmegaΩ . m,what is the diameter of the wire? (1 mile = 1.6 km)

Most telephone cables are made of copper wire of either 24 or 26 gauge.If the resistance of 24-gauge wire is 137 Ω\OmegaΩ /mile and the resistance of 26-gauge wire is 220 Ω\OmegaΩ /mile,what is the ratio of the diameter of 24-gauge wire to that of 26-gauge wire?

A conductor of radius r,length ℓ\ellℓ and resistivity ρ\rhoρ has resistance R.It is melted down and formed into a new conductor,also cylindrical,with one fourth the length of the original conductor.The resistance of the new conductor is

What is the maximum number of 100-W lightbulbs you can connect in parallel in a 120-V home circuit without tripping the 20-A circuit breaker?

What is the equivalent resistance between points a and b when R = 13 Ω\OmegaΩ ?

Light bulb A is rated at 60 W and light bulb B is rated at 100 W.Both are designed to operate at 110 V.Which statement is correct?

How long will it take a charged 80- μ\muμ F capacitor to lose 20% of its initial energy when it is allowed to discharge through a 45- Ω\OmegaΩ resistor?

What is the equivalent resistance between points a and b when R = 30 Ω\OmegaΩ ?

The electron density in copper is 8.49 *1028 electrons/m3.The electron charge is e = -1.60 *10 - 19 C.When a 1.00 A current is present in a copper wire with a 0.40 cm2 cross-section,the electron drift velocity,in m/s,with direction defined relative to the current density,is

Jadeen says that you can increase the resistance of a copper wire by hammering the wire to make it narrower and longer.Arnell says that you can increase its resistance by heating the wire.Which one,if either,is correct,and why?

In an RC circuit,how many time constants must elapse if an initially uncharged capacitor is to reach 80% of its final potential difference?

Determine the resistance R when I = 1.5 A.

A series circuit consists of a 100 V DC power source,a 100 Ω\OmegaΩ resistor,and a variable resistor of resistance R,which varies from 0 to 100 Ω\OmegaΩ .The current in the circuit is

A high-voltage transmission line carries 1 000 A at 700 kV for a distance of 100 miles.If the resistance per length in the wire is 0.5 Ω\OmegaΩ /mile,what is the power loss due to resistive losses?

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Determine the magnitude and sense (direction)of the current in the 500- $\Omega$ resistor when I = 30 mA. $Determine the magnitude and sense (direction)of the current in the 500- \Omega resistor when I = 30 mA.$

What is the magnitude of the potential difference across the 20- $\Omega$ resistor? $What is the magnitude of the potential difference across the 20- \Omega resistor?$

What is the potential difference V_b - V_a shown in the circuit below.

Determine the magnitude and sense (direction)of the current in the 10- $\Omega$ resistor when I = 1.8 A. $Determine the magnitude and sense (direction)of the current in the 10- \Omega resistor when I = 1.8 A.$

If a mile of 24-gauge copper wire has a resistance of 0.14 k $\Omega$ and the resistivity of copper is 1.7 *10 ^- ⁸ $\Omega$ . m,what is the diameter of the wire? (1 mile = 1.6 km)

Most telephone cables are made of copper wire of either 24 or 26 gauge.If the resistance of 24-gauge wire is 137 $\Omega$ /mile and the resistance of 26-gauge wire is 220 $\Omega$ /mile,what is the ratio of the diameter of 24-gauge wire to that of 26-gauge wire?

A conductor of radius r,length $\ell$ and resistivity $\rho$ has resistance R.It is melted down and formed into a new conductor,also cylindrical,with one fourth the length of the original conductor.The resistance of the new conductor is

What is the equivalent resistance between points a and b when R = 13 $\Omega$ ? $What is the equivalent resistance between points a and b when R = 13 \Omega ?$

How long will it take a charged 80- $\mu$ F capacitor to lose 20% of its initial energy when it is allowed to discharge through a 45- $\Omega$ resistor?

What is the equivalent resistance between points a and b when R = 30 $\Omega$ ? $What is the equivalent resistance between points a and b when R = 30 \Omega ?$

The electron density in copper is 8.49 10²⁸ electrons/m³.The electron charge is e = -1.60 10 ^- ¹⁹ C.When a 1.00 A current is present in a copper wire with a 0.40 cm² cross-section,the electron drift velocity,in m/s,with direction defined relative to the current density,is

A high-voltage transmission line carries 1 000 A at 700 kV for a distance of 100 miles.If the resistance per length in the wire is 0.5 $\Omega$ /mile,what is the power loss due to resistive losses?