Understanding Electrical Power Concepts

Understanding Electrical Power Concepts

Assessment

Interactive Video

Physics, Mathematics, Science

9th - 12th Grade

Practice Problem

Hard

Created by

Patricia Brown

FREE Resource

The video tutorial explains the electrical power formula P = V * I and its application in calculating power in watts. It distinguishes between electrical and mechanical power and introduces Ohm's Law (V = IR) to find power when voltage or current is not given. The tutorial derives alternative power formulas: P = I^2R and P = V^2/R, and demonstrates their use through examples involving series circuits with resistors. The video emphasizes understanding and applying these formulas to solve for power in different scenarios.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the basic formula for electrical power?

P = I - V

P = V + I

P = V * I

P = V / I

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the unit of electrical power?

Volts

Amperes

Watts

Ohms

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT a component of Ohm's Law?

Resistance (R)

Power (P)

Potential difference (V)

Current (I)

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which formula represents Ohm's Law?

R = V / I

V = I * R

I = V * R

P = V * I

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How can you express power if voltage is unknown?

P = V * I

P = I^2 * R

P = I / R

P = V^2 / R

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to power if both current and resistance are doubled?

Power remains the same

Power is halved

Power is doubled

Power is quadrupled

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the formula for power when current is not given?

P = V / I

P = V^2 / R

P = I^2 * R

P = V * I

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