Electric Circuits

Question 1

What is the equation for power?

Answer 1

P = I x V
Power = Current x Voltage
(W) = (A) x (V)

Question 2

What is the equation for energy transferred by an appliance?

Answer 2

E = I x V x t
Energy Transferred = Current x Voltage x Time
(J) = (A) x (V) x (s)

Question 3

What is the equation for resistance?

Answer 3

R = V / I
Resistance = Voltage / Current
(Ohms) = (V) / (A)

Question 4

What is current?

Answer 4

The rate of flow of charge.

Question 5

What is electric current in solid metallic conductors?

Answer 5

A flow of negatively charged electrons.

Question 6

What is the rule for voltage in a parallel circuit?

Answer 6

V1 = V2 = V3

Question 7

What is voltage?

Answer 7

The energy transferred per unit charge.

Question 8

What is the relationship between current and voltage in a wire at a fixed temperature?

Answer 8

Current is proportional to voltage.

Question 9

What is the relationship between current and voltage in a metal filament lamp?

Answer 9

A curved graph. As potential difference increases, the current increases, therefore the temperature of the lamp increases. As temperature increases, resistance increases, so current decreases.