P2: Electricity

Question 1

Charge

Answer 1

Charged object produces electric field around itself
Field lines point from positive to negative
Rubbing together= rubs electrons off one material onto other
Material gaining electrons= negatively charged

Question 2

What is potential difference measured in?

Answer 2

Measured in V (volts)

Question 3

Resistance
Stays?
Current?

Answer 3

Resistance stays connected
Current is directly proportional to potential difference

Question 4

Ohmic conductors
Temp?

Answer 4

Applies at constant temp

Question 5

3pin plug wires?

Answer 5

Earth wire= green and yellow stripes
Prevents from becoming live
Neutral wire= blue
Completed circuit
Live wire= brown mains electricity voltage 230V

Question 6

Define current (I)
Equation?
Measured in ?

Answer 6

Rate of flow of charge
V= I x R
Measured in amps

Question 7

Define power (w)
Equation?
Measured in?

Answer 7

Rate of energy transfer
Power= work/time or force x velocity P= I x V
Measured in watts

Question 8

Define resistance (r)
Measured in?

Answer 8

How hard it is for charge to flow
Measured in Ohms

Question 9

Define charge (Q)
Equation
Measured in?

Answer 9

Only flows if there’s a source of potential difference
Q= I x T or E= Q x V
Measured in coulombs

Question 10

Series and parallel circuits

Answer 10

Direct current flows in one direction
Alternating current continually changes
Parallel current split between branches
Series circuit current is constant

Question 11

Resistance required practical
Equation

Answer 11

R= v/I
Resistance = potential different (V) divided by I (current) (A)