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

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

A) watt
B) volt
C) amp
D) joules

E) C) and D)
F) A) and C)

Correct Answer

verified

Show Answer

Question 2

Multiple Choice

Review LaterAdd Note

Review Later

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

A) 85
B) 90
C) 99.9
D) 100

E) C) and D)
F) B) and D)

Correct Answer

verified

Show Answer

Question 3

True/False

Review LaterAdd Note

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

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.

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

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

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

Work equals ____ times Distance.

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

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

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

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.

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.

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.

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

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

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.

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