Exam 5: Powers and Roots

If a 250,000 circular mil cable is composed of 37 strands, what is the approximate diameter of each strand? Carry the answer to two decimal places.

When a number must be squared, the square key symbol on a calculator is:

An electrical cable has a cross-sectional area (CM) of 1,000,000 circular mils and contains 19 strands. Find the diameter (d) of each strand using $E _ { a }$ . Carry the answer to two decimal places.

Use one space between the number and the scientific notation exponent. A scientific calculator is set to operate in the Floating Decimal mode (Flo). The calculator display shows 945635.045. If the calculator is changed to operate in the Scientific mode (Sci), what would the display show?

If a calculator does not contain an n^th root key, the n^th power key can be used by raising the number to the reciprocal of the power.

The resistance of a coil that uses 800 watts is 62 ohms. What is the voltage of the circuit? Round the answer to the nearest hundredth. f= where f= frequency in hertz P = number of pairs of poles N = revolution per minute $\text { volts } = \sqrt { \text { watts } \times \text { ohms } }$

$E _ { i } = E _ { \max } \sin \theta$ Find the number of volts in the circuit if the resistance has a value of 22 ohms and uses 550 watts.

The square of the diameter equals the cross-sectional area. A cable is checked for a power job and is found to be too small. The cable contains 62 strands of copper wire that each have a diameter of 37.2 mils. What is the size of the cable in circular mils? Carry the answer to two decimal places.

$E _ { i } = E _ { \max } \sin \theta$ If the resistance has a value of 550 ohms and uses 22 watts of power, find the number of amperes of current that the resistance takes. Carry the answer to one decimal place.

480 volts is connected to an 18-ohm resistive-heating element. How much power is being produced by the heating element? Carry the answer to three decimal places.

A 24-ohm resister has a current of 0.65 amperes flowing through it. How much power is being produced by the resister? Carry the answer to two decimal places.

$O P = V _ { 1 } ^ { 2 } + V _ { 2 } ^ { 2 } + 2 \left( V _ { 1 } \right) \left( V _ { 2 } \right) \cos \theta$ A calculator is set in the Engineering mode. The display shows: 56.345 -03. Express this value in the proper engineering units.

If the cross-sectional area in a circular mils of a wire is 4.107, what is the diameter in mils? Carry the answer to two decimal places.

If [30][X²][=] is entered in a calculator the display will show:

The square root key on a calculator looks like:

To find the number of watts used in any circuit, the amperes squared are multiplied by ohms. Find the number of watts for the device shown. Carry the answer to two decimal places. $E _ { \text {LINE } }$

Using the reciprocal key on a calculator, the reciprocal of 4 is:

The square of the diameter equals the cross-sectional area. Find the cross-sectional area in the circular mils of a wire that is 104 mils in diameter.

$O P = V _ { 1 } ^ { 2 } + V _ { 2 } ^ { 2 } + 2 \left( V _ { 1 } \right) \left( V _ { 2 } \right) \cos \theta$ A radio signal is measured at 150 microvolts ( $R _ { 1 } = 0$ ). Express this as volts.

When using a Texas Instruments TI 36X calculator, to activate the scientific notation mode press the following keys: