Physics electrical circuits

Q: What does power measure?

A: The rate of energy transfer.

Q: What is the unit of power?

Q: What is the unit of power?

Q: What is the unit of energy?

Joules (J).

Q: What is the unit of time?

Seconds (s).

What is the unit of current?

Amperes (A).

What is the unit of potential difference?

Volts (V).

What is the equation for power?

P = E ÷ t.

What is the equation for energy transferred?

E = P × t.

What is the electrical power equation?

P = I × V.

What does P represent?

Power, measured in watts.

What does E represent?

: Energy transferred, measured in joules.

What does t represent?

Time, measured in seconds.

What does I represent?

Current, measured in amperes.

What does V represent?

Potential difference, measured in volts.

What is 1 kilowatt equal to?

1,000 watts.

A 100 W lamp runs for 20 seconds. Calculate energy transferred.

E = 100 × 20 = 2,000 J.

A 2,000 W heater runs for 60 seconds. Calculate energy transferred.

E = 2,000 × 60 = 120,000 J.