FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 9: Electrical Power and Energy

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 1

Multiple Choice

Review LaterAdd Note

Review Later

The four letters ____ represent the unknown quantities in electrical power that may need to be found.

A) P, I, M, and E
B) I, M, E, and A
C) P, I, R, and E
D) I, M, R, and A

Correct Answer

verified

Show Answer

Question 2

Multiple Choice

Review LaterAdd Note

Review Later

Most common heating devices, such as toasters, irons, and electric ranges, are heated by current in a coil of ____ alloy wire or ribbon.

A) copper
B) silver
C) chromium
D) nickel-chromium

Correct Answer

verified

Show Answer

Question 3

Multiple Choice

Review LaterAdd Note

Work equals ____ times Distance.

Another equation for electrical power is P equals ____ divided by R.

The foot-pound is the energy unit commonly used in the American system of measurements.

The words power and energy can be interchanged where measurement is concerned.

In general, energy can be converted from one form to another, and the efficiency of this energy conversion is a way of measuring how well the energy-converting device accomplishes its task.

Electrical energy is commercially sold in units called kilowatt-minutes.

The energy of the motion of a ball is called kinetic energy.

Because the unit joules per second is used so often, it is replaced with the single term ____.

When James Watt started to sell steam engines, he found that an average horse, working at a steady rate, could do ____ foot-pounds of work per second.

The electrical energy delivered to consumers is measured by an instrument known as the ____ meter.

One watt of power is dissipated (in the form of heat) when 1 volt of electrical pressure forces 1 ampere of current through the resistance of 1 ohm.

James Watt compared the power of his steam engines to the amount of work an average team of horses could accomplish.

The lifting of a weight illustrates the meaning of a unit of measurement of energy.

The efficiency of any device can be no greater than ____%.

The following changes all require ____: mechanical movement, the production of heat or light, the production of sound, the conversion of one chemical compound into another, and the production of radio waves.

A ____ is the energy needed to raise the temperature of 1 gram of water 1 degree Celsius.

Energy indicates how fast power is used or produced.

When a 20-pound weight is lifted 5 feet, it has 100 foot-pounds of potential energy that it did not have when it was on the ground.