Electricity

Question 1

What is current?

Answer 1

The rate of flow of charge.

Question 2

What is potential difference?

Answer 2

The work done (energy transferred) per unit charge across a component.

Question 3

What is the effect on a circuit after adding a component…. In series.

Answer 3

Overall total resistance will increase, therefore current will decrease as it has to pass through all components.

Question 4

What is the effect on adding a component to a circuit in parallel?

Answer 4

Overall total resistance will decrease, therefore current will increase as it will go through the component with the lease amount of resistance as there is now a pathway.

Question 5

Equation for current…

Answer 5

I=Q/t
I is measured in Amps
Q is measured in C
T is measured in seconds

Question 6

Equation for potential difference….

Answer 6

V=E/Q

Question 7

What is Ohms Law???

Answer 7

The p.d across a metallic conductor is directly proportional to the current going through it. This is true as long as the physical conditions do not change i.e. temperature.

Question 8

What is resistance?

Answer 8

The voltage required to produce a unit of charge.

Question 9

Equation for Ohms Law..

Answer 9

V=IR
V= Potential difference (V)
I= Current (A)
R= Resistance (Ohms)