P5.3 - Electrical Power An Dpotential Difference (Finished I think)

Question 1

How do you calculate the power of an appliance (without pd) (plus units)?

Answer 1

Power (Watts) = energy transferred (Joules) / time (seconds)

Question 2

How do you calculate the energy transferred by electrical work? (Give units)

Answer 2

Energy transferred (J) = Power (W) * Time (s)

Question 3

What is the power of an appliance?

Answer 3

The power of an appliance is the power it transfers per second

Question 4

What is the equation that links power, potential difference and current?

Answer 4

Power (W) = PD (V) * Current (A)

Question 5

What is the equation that links power, current and resistance?

Answer 5

Power (Watts) = Current^2 (A) * resistance (ohms)

Question 6

The current through an appliance is the ___ flowing through it per __

Answer 6

Charge, second

Question 7

The potential difference across an appliance is the ___ to the appliance by ___

Answer 7

Energy transferred, each coulomb of charge that passes through it

Question 8

How do you calculate the correct rating in Amperes for a fuse?

Answer 8

Rating (A) = electrical power (W) / potential difference (V)