3.9 Power

Question 1

Definition of power

Answer 1

The rate at which work is performed

Question 2

Equation for power

Answer 2

P = V x I

Or

P = I^2 x R

Question 3

What are the two methods of measuring electrical power?

Answer 3

Using a wattmeter (Direct method)

Or

Measuring voltage and current with a voltmeter and an ammeter (Indirect method)

Question 4

What are the two forms that energy can be stored?

Answer 4

Potential energy and kinetic energy

Question 5

Kinect energy equation

Answer 5

W = 1/2 mv²

Question 6

Potential energy equation

Answer 6

W=mxgxh

Question 7

Electrical work equation

Answer 7

W=VxQ

W is the work, V is the voltage and Q is the charge