Two resistors R1 and R2 are connected in parallel,and this combination is connected in series with a third resistor R3.If R1 = 5.0 $\Omega$,R2 = 2.0 $\Omega$,and R3 = 6.0 $\Omega$,what is the equivalent resistance of this combination?

A) 0.3l $\Omega$ B) 3.2 $\Omega$ C) 6.7 $\Omega$ D) 7.4 $\Omega$ E) 13 $\Omega$ A) 0.3l $\Omega$ B) 3.2 $\Omega$ C) 6.7 $\Omega$ D) 7.4 $\Omega$ E) 13 $\Omega$

Exam 25: Electric Current and Direct-Current Circuits

A galvanometer has an internal resistance of 200 $\Omega$ and requires a current of 5.0 mA for full-scale deflection.What resistance should be connected in parallel with this galvanometer to make an ammeter that reads 10 A at full-scale deflection?

(Multiple Choice)

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Question 21

You connect two similar heating coils in series on a constant-voltage line.When you later connect them in parallel to the same line,the heat developed per minute,compared with the former rate,is approximately

(Multiple Choice)

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Question 22

If 4.7 $\times$ 10¹⁶ electrons pass a particular point in a wire every second,what is the current in the wire?

(Multiple Choice)

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Question 23

A wire of length L and resistance R is now drawn out by pulling such that its new length is 1.5L.What is its new resistance? (Assume the density remains constant.)

(Multiple Choice)

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Question 24

For copper, $\rho$ = 8.93 g/cm³ and M = 63.5 g/mol.Assuming one free electron per copper atom,what is the drift velocity of electrons in a copper wire of radius 0.625 mm carrying a current of 3 A?

(Multiple Choice)

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Question 25

An electric generator supplies power as a function of time according to the expression where the units are SI.The electric energy provided by the generator between t = 0 and t = 1 s is

(Multiple Choice)

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Question 26

For copper, $\rho$ = 8.93 g/cm³ and M = 63.5 g/mol.Assuming one free electron per copper atom,what is the drift velocity of electrons in a copper wire of radius 0.435 mm carrying a current of 5 A?

(Multiple Choice)

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Question 27

A wire of length L and resistance R is cut into 4 equal pieces.If the 4 pieces are now twisted together to make a wire of length L/4,what is the new resistance of the shorter wire combination?

(Multiple Choice)

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Question 28

A current of 0.50 A passes through a lamp with a resistance of 600 $\Omega$ .The power supplied to this lamp is

(Multiple Choice)

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Question 29

An immersion heater of negligible mass draws a current of 7.5 A from a source with a potential difference of 120 V.The heater is in 0.950 m³ of water.The initial temperature of the water is 12.5ºC.How much time does it take to increase the temperature of the water to 27.5ºC? Neglect any heat loss.One calorie is equivalent to 4.18 J.

(Multiple Choice)

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Question 30

You leave your 120-W light bulb on in your room by mistake while you are at school for 8.5 hours.If the price of electrical energy is $0.085 per kilowatt-hour,how much did it cost you?

(Multiple Choice)

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Question 31

Use the diagram below for the next problem: -The diagram shows the current versus voltage for a diode.The region which has the least resistance is

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Question 32

A sensitive galvanometer has a resistance of 180 $\Omega$ and requires 2.4 $\mu$ A of current to produce a full-scale deflection.The shunt resistance needed to construct an ammeter that gives full-scale deflection for a current of 1.0 mA is approximately

(Multiple Choice)

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Question 33

A wire 10 m long with a diameter of 1.0 mm has a resistance of 5.0 $\Omega$ .The resistance of a second wire made of the same material,but 3.0 m long with a diameter of 4.0 mm,is approximately

(Multiple Choice)

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Question 34

Two resistors R₁ and R₂ are connected in parallel,and this combination is connected in series with a third resistor R₃.If R₁ = 5.0 $\Omega$ ,R₂ = 2.0 $\Omega$ ,and R₃ = 6.0 $\Omega$ ,what is the equivalent resistance of this combination?

(Multiple Choice)

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Question 35

An energy efficient light bulb uses 15 W of power for an equivalent light output of a 60 W incandescent light bulb.How much energy is saved each month by using the energy efficient light bulb instead of the incandescent light bulb for 4 hours a day? Assume that there are 30 days in one month.

(Multiple Choice)

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Question 36

Wire A,which is of the same material and cross-sectional area as wire B,is twice as long as wire B.If the resistance of wire B is R,what is the resistance of wire A?

(Multiple Choice)

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Question 37

Doubling the capacitance in an RC circuit

(Multiple Choice)

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Question 38

Use the following figures to answer the next problem. $Use the following figures to answer the next problem. -An uncharged capacitor and a resistor are connected in series to a battery as shown. If \varepsilon = 15 V,C = 20 \mu F,and R = 4.0 \times 10<sup>5</sup> \Omega ,the maximum charge on the capacitor is approximately$ -An uncharged capacitor and a resistor are connected in series to a battery as shown. If $\varepsilon$ = 15 V,C = 20 $\mu$ F,and R = 4.0 $\times$ 10⁵ $\Omega$ ,the maximum charge on the capacitor is approximately

(Multiple Choice)

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Question 39

In a certain particle accelerator,a current of 300 $\mu$ A is carried by a 4.00-MeV proton beam that has a radius of 1.30 mm.The mass of a proton is 1.67 $\times$ 10^-27 kg.What is the number of protons per unit volume in this beam?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 107

Exam 25: Electric Current and Direct-Current Circuits

A galvanometer has an internal resistance of 200 Ω\OmegaΩ and requires a current of 5.0 mA for full-scale deflection.What resistance should be connected in parallel with this galvanometer to make an ammeter that reads 10 A at full-scale deflection?

You connect two similar heating coils in series on a constant-voltage line.When you later connect them in parallel to the same line,the heat developed per minute,compared with the former rate,is approximately

If 4.7 ×\times× 1016 electrons pass a particular point in a wire every second,what is the current in the wire?

A wire of length L and resistance R is now drawn out by pulling such that its new length is 1.5L.What is its new resistance? (Assume the density remains constant.)

For copper, ρ\rhoρ = 8.93 g/cm3 and M = 63.5 g/mol.Assuming one free electron per copper atom,what is the drift velocity of electrons in a copper wire of radius 0.625 mm carrying a current of 3 A?

An electric generator supplies power as a function of time according to the expression where the units are SI.The electric energy provided by the generator between t = 0 and t = 1 s is

For copper, ρ\rhoρ = 8.93 g/cm3 and M = 63.5 g/mol.Assuming one free electron per copper atom,what is the drift velocity of electrons in a copper wire of radius 0.435 mm carrying a current of 5 A?

A wire of length L and resistance R is cut into 4 equal pieces.If the 4 pieces are now twisted together to make a wire of length L/4,what is the new resistance of the shorter wire combination?

A current of 0.50 A passes through a lamp with a resistance of 600 Ω\OmegaΩ .The power supplied to this lamp is

You leave your 120-W light bulb on in your room by mistake while you are at school for 8.5 hours.If the price of electrical energy is $0.085 per kilowatt-hour,how much did it cost you?

Use the diagram below for the next problem: -The diagram shows the current versus voltage for a diode.The region which has the least resistance is

A sensitive galvanometer has a resistance of 180 Ω\OmegaΩ and requires 2.4 μ\muμ A of current to produce a full-scale deflection.The shunt resistance needed to construct an ammeter that gives full-scale deflection for a current of 1.0 mA is approximately

A wire 10 m long with a diameter of 1.0 mm has a resistance of 5.0 Ω\OmegaΩ .The resistance of a second wire made of the same material,but 3.0 m long with a diameter of 4.0 mm,is approximately

Two resistors R1 and R2 are connected in parallel,and this combination is connected in series with a third resistor R3.If R1 = 5.0 Ω\OmegaΩ ,R2 = 2.0 Ω\OmegaΩ ,and R3 = 6.0 Ω\OmegaΩ ,what is the equivalent resistance of this combination?

An energy efficient light bulb uses 15 W of power for an equivalent light output of a 60 W incandescent light bulb.How much energy is saved each month by using the energy efficient light bulb instead of the incandescent light bulb for 4 hours a day? Assume that there are 30 days in one month.

Wire A,which is of the same material and cross-sectional area as wire B,is twice as long as wire B.If the resistance of wire B is R,what is the resistance of wire A?

Doubling the capacitance in an RC circuit

Use the following figures to answer the next problem. -An uncharged capacitor and a resistor are connected in series to a battery as shown. If ε\varepsilonε = 15 V,C = 20 μ\muμ F,and R = 4.0 ×\times× 105 Ω\OmegaΩ ,the maximum charge on the capacitor is approximately

In a certain particle accelerator,a current of 300 μ\muμ A is carried by a 4.00-MeV proton beam that has a radius of 1.30 mm.The mass of a proton is 1.67 ×\times× 10-27 kg.What is the number of protons per unit volume in this beam?

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A galvanometer has an internal resistance of 200 $\Omega$ and requires a current of 5.0 mA for full-scale deflection.What resistance should be connected in parallel with this galvanometer to make an ammeter that reads 10 A at full-scale deflection?

If 4.7 $\times$ 10¹⁶ electrons pass a particular point in a wire every second,what is the current in the wire?

For copper, $\rho$ = 8.93 g/cm³ and M = 63.5 g/mol.Assuming one free electron per copper atom,what is the drift velocity of electrons in a copper wire of radius 0.625 mm carrying a current of 3 A?

For copper, $\rho$ = 8.93 g/cm³ and M = 63.5 g/mol.Assuming one free electron per copper atom,what is the drift velocity of electrons in a copper wire of radius 0.435 mm carrying a current of 5 A?

A current of 0.50 A passes through a lamp with a resistance of 600 $\Omega$ .The power supplied to this lamp is

A sensitive galvanometer has a resistance of 180 $\Omega$ and requires 2.4 $\mu$ A of current to produce a full-scale deflection.The shunt resistance needed to construct an ammeter that gives full-scale deflection for a current of 1.0 mA is approximately

A wire 10 m long with a diameter of 1.0 mm has a resistance of 5.0 $\Omega$ .The resistance of a second wire made of the same material,but 3.0 m long with a diameter of 4.0 mm,is approximately

Two resistors R₁ and R₂ are connected in parallel,and this combination is connected in series with a third resistor R₃.If R₁ = 5.0 $\Omega$ ,R₂ = 2.0 $\Omega$ ,and R₃ = 6.0 $\Omega$ ,what is the equivalent resistance of this combination?

In a certain particle accelerator,a current of 300 $\mu$ A is carried by a 4.00-MeV proton beam that has a radius of 1.30 mm.The mass of a proton is 1.67 $\times$ 10^-27 kg.What is the number of protons per unit volume in this beam?