Power, Voltage, and Resistance Concepts

Power, Voltage, and Resistance Concepts

Assessment

Interactive Video

Physics

9th - 10th Grade

Hard

Created by

Patricia Brown

FREE Resource

The video tutorial covers three examples related to electrical power. The first example calculates the charge passing through a device using given power and voltage. The second example determines the energy dissipated by a lamp over a time interval using current and voltage. The third example finds the final voltage in a circuit when the power consumption of a bulb changes, assuming constant resistance.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the charge passing through a 15-watt device connected to a 10-volt battery over four hours?

1.08 x 10^4 coulombs

2.16 x 10^4 coulombs

4.32 x 10^4 coulombs

3.24 x 10^4 coulombs

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the power formula used in the first example?

Power = Voltage - Current

Power = Current x Voltage

Power = Voltage / Current

Power = Current / Voltage

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do you calculate the current flowing through a device if you know the power and voltage?

Add power and voltage

Divide power by voltage

Multiply power by voltage

Subtract voltage from power

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the second example, what is the energy dissipated by the lamp in two minutes?

324 joules

216 joules

432 joules

108 joules

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the formula for calculating energy dissipated using power and time?

Energy = Power / Time

Energy = Power x Time

Energy = Power + Time

Energy = Power - Time

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If a 100-watt bulb is designed for 120 volts, what is the final voltage when it consumes only 90 watts?

114 volts

116 volts

112 volts

110 volts

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What remains constant in the third example when calculating the final voltage of the bulb?

Voltage

Current

Power

Resistance

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