Exam 5: Powers and Roots

$E _ { i } = E _ { \max } \sin \theta$ When the power is 220 watts and the resistance is 100 ohms, what voltage is in the circuit? Carry the answer to two decimal places.

$E _ { i } = E _ { \max } \sin \theta$ When the resistance is 73.3 ohms and the power is 165 watts, what is the value of the current in amperes? Carry answer to two decimal places.

$E _ { i } = E _ { \max } \sin \theta$ How many volts are required if the power is 25 watts and the resistance is 64 ohms?

$O P = V _ { 1 } ^ { 2 } + V _ { 2 } ^ { 2 } + 2 \left( V _ { 1 } \right) \left( V _ { 2 } \right) \cos \theta$ An industrial plant is supplied with high voltage power from the power company. The power lines are rated 13.8 kV. Express this value as volts.

A cable is checked for a power installation and is found to be too small. The cable has 37 strands of copper wire, each having a diameter of 82.2 mils. Find the size of the cable in circular mils. Carry answer to two decimal places.

The number of watts used in a circuit is equal to the volts squared divided by the ohms. Find the wattage used in the circuit shown. Round the answer to the nearer tenth. $E _X$

If a 5,000,000 circular mil cable is composed of 37 strands of copper wire of equal size. What is the approximate diameter of one strand? Carry the answer to two decimal places.

A scientific calculator is set to operate in the Floating Decimal mode (Flo). The calculator display shows 945635.045. Now set the calculator to Engineering mode (Eng). What would the display show?

A 2,583-circular-mil cable is composed of 25 strands of copper wire of equal size. What is the approximate diameter of one strand? Round the answer to the nearest tenth.