Question 1

If one needed a very high power rating, an appropriate choice for the resistor would be:

Accepted Answer

A)  metal-film 
B)  carbon-composition 
C)  wire wound 
D)  carbon-film 
A)  metal-film 
B)  carbon-composition 
C)  wire wound 
D)  carbon-film C

Question 2

A system with an input power of 50 W and an output of 20 W has an efficiency of:

Accepted Answer

A)  50% 
B)  20% 
C)  25% 
D)  40% 
A)  50% 
B)  20% 
C)  25% 
D)  40% D

Question 3

Power companies charge for energy used on the basis of:

Accepted Answer

A)  Wh 
B)  kW 
C)  kWh 
D)  MWh 
A)  Wh 
B)  kW 
C)  kWh 
D)  MWh C

Question 4

How much energy does a 6 V battery have when it stores 12 coulombs of charge?

Accepted Answer

A)  5 joules 
B)  2 joules 
C)  432 joules 
D)  72 joules 
A)  5 joules 
B)  2 joules 
C)  432 joules 
D)  72 joules

Question 5

One Watt equals one Joule per second.

Accepted Answer

A) True 
 B)False

Question 6

The length of time that a battery can deliver a certain amount of average current to a load at the rated voltage is called the:

Accepted Answer

A)  ampere-hour rating 
B)  current rating 
C)  minimum power rating 
D)  voltage rating 
A)  ampere-hour rating 
B)  current rating 
C)  minimum power rating 
D)  voltage rating

Question 7

The rate at which work is performed is called power.

Accepted Answer

A) True 
 B)False

Question 8

The maximum amount of power a resistor can safely handle without damage is called:

Accepted Answer

A)  power rating 
B)  watts 
C)  heat 
D)  surface area 
A)  power rating 
B)  watts 
C)  heat 
D)  surface area

Question 9

Express 0.15 mW as µW.

Accepted Answer

A)  0.00015 µW 
B)  15 µW 
C)  1.5 µW 
D)  150 µW 
A)  0.00015 µW 
B)  15 µW 
C)  1.5 µW 
D)  150 µW

Question 10

The symbol for power is:

Accepted Answer

A)  J 
B)  P 
C)  W 
D)  I 
A)  J 
B)  P 
C)  W 
D)  I

Question 11

-Given the circuit in Figure , what is the resistance of the lamp?

Accepted Answer

A)  120 Ω 
B)  1.2 Ω 
C)  Not enough data to calculate the resistance 
D)  12 Ω 
A)  120 Ω 
B)  1.2 Ω 
C)  Not enough data to calculate the resistance 
D)  12 Ω

Question 12

The change in energy from one end of a resistor to another creates:

Accepted Answer

A)  voltage loss 
B)  voltage gain 
C)  voltage rise 
D)  voltage drop 
A)  voltage loss 
B)  voltage gain 
C)  voltage rise 
D)  voltage drop

Question 13

A voltage drop is:

Accepted Answer

A)  called a difference of potential 
B)  the comparison of energy lost from one end of a resistance to the other 
C)  the loss of energy by electrons as they flow through a resistance 
D)  all of the above 
A)  called a difference of potential 
B)  the comparison of energy lost from one end of a resistance to the other 
C)  the loss of energy by electrons as they flow through a resistance 
D)  all of the above

Question 14

50 mA of current flows through a 10 kΩ resistor. How much power is dissipated?

Accepted Answer

A)  25 mW 
B)  5 µW 
C)  0.25 µW 
D)  25 W 
A)  25 mW 
B)  5 µW 
C)  0.25 µW 
D)  25 W

Question 15

-If you installed a 33 Ω, 1 watt resistor in the circuit in Figure , the resistor will probably:

Accepted Answer

A)  burn up 
B)  work fine 
C)  produce a little heat 
D)  short 
A)  burn up 
B)  work fine 
C)  produce a little heat 
D)  short

Question 16

One kilowatt-hour is equivalent to:

Accepted Answer

A)  1.0 × 103 joules 
B)  3.6 × 105 joules 
C)  3.6 × 106 joules 
D)  60 × 104 joules 
A)  1.0 × 103 joules 
B)  3.6 × 105 joules 
C)  3.6 × 106 joules 
D)  60 × 104 joules

Question 17

A 5.1 kΩ resistor has burned out in a circuit. You are to replace it with one of like ohmic value. If the resistor should carry 15 mA, which of the following standard resistors should one use?

Accepted Answer

A)  5.1 kΩ, 5 W 
B)  5.1 kΩ, 1 W 
C)  5.1 kΩ, 1/2 W 
D)  5.1 kΩ, 2 W 
A)  5.1 kΩ, 5 W 
B)  5.1 kΩ, 1 W 
C)  5.1 kΩ, 1/2 W 
D)  5.1 kΩ, 2 W

Question 18

If a lamp transforms 120 joules of energy into light and heat every 2 seconds, how much power does it use?

Accepted Answer

A)  240 W 
B)  480 W 
C)  120 W 
D)  60 W 
A)  240 W 
B)  480 W 
C)  120 W 
D)  60 W

Question 19

What is the kilowatt-hour consumption of a 40 W lamp if it remains "on" for 1750 hours?

Accepted Answer

A)  70.00 
B)  43.75 
C)  43,750 
D)  70,000 
A)  70.00 
B)  43.75 
C)  43,750 
D)  70,000

Question 20

Voltage in a circuit is 100 V, the resistance is 10 kΩ. Determine the power.

Accepted Answer

A)  1 W 
B)  0.1 W 
C)  10 W 
D)  0.01 W 
A)  1 W 
B)  0.1 W 
C)  10 W 
D)  0.01 W

Exam 4: Energy and Power

If one needed a very high power rating, an appropriate choice for the resistor would be:

A system with an input power of 50 W and an output of 20 W has an efficiency of:

Power companies charge for energy used on the basis of:

How much energy does a 6 V battery have when it stores 12 coulombs of charge?

One Watt equals one Joule per second.

The length of time that a battery can deliver a certain amount of average current to a load at the rated voltage is called the:

The rate at which work is performed is called power.

The maximum amount of power a resistor can safely handle without damage is called:

Express 0.15 mW as µW.

The symbol for power is:

-Given the circuit in Figure , what is the resistance of the lamp?

The change in energy from one end of a resistor to another creates:

A voltage drop is:

50 mA of current flows through a 10 kΩ resistor. How much power is dissipated?

-If you installed a 33 Ω, 1 watt resistor in the circuit in Figure , the resistor will probably:

One kilowatt-hour is equivalent to:

A 5.1 kΩ resistor has burned out in a circuit. You are to replace it with one of like ohmic value. If the resistor should carry 15 mA, which of the following standard resistors should one use?

If a lamp transforms 120 joules of energy into light and heat every 2 seconds, how much power does it use?

What is the kilowatt-hour consumption of a 40 W lamp if it remains "on" for 1750 hours?

Voltage in a circuit is 100 V, the resistance is 10 kΩ. Determine the power.

Quantities and Units

Voltage, Current, and Resistance

Ohms Law

Series Circuits

Parallel Circuits

Series-Parallel Circuits

Circuit Theorems and Conversions

Branch, Loop, and Node Analyses

Magnetism and Electromagnetism

Introduction to Alternating Current and Voltage

Capacitors

Inductors

Transformers

Rc Circuits

Rl Circuits

Rlc Circuits and Resonance

Passive Filters

Circuit Theorems in Ac Analysis

Time Response of Reactive Circuits

Three-Phase Systems in Power Applications

Filters