Characteristics of Electricity

Power is best described as
1. the rate of change in energy.
2. the amount of energy a device uses.
3. the amount of electricity a device uses.
4. the amount of potential difference that a device must be connected to.
Which of the following is the correct unit of power?
1. Watt
2. Joule
3. Volt
4. Ampere
The unit for power can also be expressed as
1. joules per second.
2. watts per second.
3. volts per second.
4. amperes per second.
Which of the following formulas is the correct for calculating power?
1. P = IV
2. P = I/V
3. P = V/I
4. P = I + V
If a 12.0 V battery supplies a current 1.50 A, what is the power output of the battery?
1. 18.0 W
2. 8.00 W
3. 0.125 W
4. 13.5 W
A 100 W light bulb is connected to 115 V. What current passes through the light bulb?
1. 0.870 A
2. 1.15 A
3. 11.5 kA
4. 215 A
A holiday bulb operates on 4.0 V and draws 2.0 A of current. What is the power of the bulb?
1. 8.0 W
2. 6.0 W
3. 2.0 W
4. 0.50 W
How much electrical energy is consumed by a 100 W light bulb if it is left on for 1.50 h?
1. 540 kJ
2. 150 J
3. 9.00 kJ
4. 66.7 J
A 1200 W hotplate is used continuously for 20.0 min. How much electrical energy does the hotplate use in this time?
1. 1.44 x 10⁶ J
2. 2.4 x 10⁴ J
3. 400 J
4. 60.0 J
Which unit is used by electrical companies to express large amounts of electrical energy?
1. Kilowatt-hour
2. Kilowatt
3. Kilojoule
4. Kilojoule-hour

Characteristics of Electricity - Section 9.2 Quiz