Deck 6: Electrical Energy and Power

Question 1

Energy is the ability to do ___________________.

Answer 1

work

Question 2

If a 2-pound weight is lifted a distance of 3 feet, the work done is equal to 5 foot-pounds.

Answer 2

False

Question 3

Define energy, work, and power.

Answer 3

Energy is the ability to do work. Work is the product of force and distance, or Work = Force × Distance. Power is the rate of doing work. The faster a given amount of work is accomplished, the greater the power required. While power is a function of time, work is not.

Question 4

An elevator motor does more work if the elevator moves quickly to the top floor than it does if it moves slowly.

Question 5

___________________ is the rate of doing work.

Question 6

The faster a given amount of work is accomplished, the greater the power required.

Question 7

Determine the cost of operating a television set for 12 hours. The set is rated at 200 watts, and the cost of energy is at the rate of 5 cents per kWh.

Question 8

Work = Force × ____________________.

Question 9

The instrument used to measure power is the ___________________.

Question 10

The watt (W) is used as the unit of electrical power.

Question 11

Does the power company charge for power or energy? Explain your answer.