P2

Question 1

Series Circuit

Answer 1

One loop of wire

Question 2

Parallel circuit

Answer 2

2 or more loops of wire

Question 3

Current

Answer 3

The rate of flow of charge

Question 4

Potential difference

Answer 4

The difference in amount of energy that charge carriers have between two points in a circuit

Question 5

Resistance

Answer 5

A measure of How hard it is for the current to pass through a component in a circuit

Question 6

Ohm’s law

Answer 6

The current through a resistor is DIRECTLY proportional to the potential difference provided that the temperature is constant

Question 7

Ohmi conductor

Answer 7

An electric component where potential difference is directly proportional to current e.g. resistor

Question 8

Non - ohmic conductor

Answer 8

An electric component that does NOT follow Ohm’s law - the current and potential difference are NOT directly proportional

Question 9

What is the formula that links current, charge and time?

Answer 9

Q = I x T 
Q = Coulombs 
I = Amps 
T = Seconds

Question 10

How does current behave in a series circuit

Answer 10

Current is the same throughout the series circuit

Question 11

How does current behave in a parallel circuit

Answer 11

Current splits at junctions in a parallel circuit ; it is different in different loops

Question 12

What is the formula that links potential difference, charge and energy?

Answer 12

E = Q x V 
E = Joules 
Q = Charge 
V = Potential Difference

Question 13

What is the formula that links Energy, Power and time?

Answer 13

P = E/T 
P = Watts 
E = Joules 
T =  Seconds

Question 14

How do u convert KW into W

Answer 14

Multiply by 1000

Question 15

How do u convert mA into Amps

Answer 15

Divide by 1000

Question 16

Alternating current

Answer 16

In A.C, the current is constantly changing direction

Question 17

Direct current

Answer 17

D.C only flows in one direction

Question 18

National Grid

Answer 18

A network of transformers and cables that supply the UK with electricity

Question 19

Step - Up Transformer

Answer 19

Increases the voltage in the cables which decreases the current. This also decreases the resistance so less heat is lost from the wires

Question 20

Electric Field lines

Answer 20

Electric field lines flow away from the positive charges and towards the negative charges

Question 21

What is the formula that links current, voltage and resistance? Include the units for each

Answer 21

V = I x R 
V = Volts 
I = Amps 
R = Ohms

Question 22

How do u calculate resistance in a series circuit

Answer 22

Add up the resistance of all resistors in the circuit

Question 23

What happens to the total resistance of two resistors in parallel

Answer 23

the total resistance of two resistors in parallel is less than the resistance of the smallest resistor

Question 24

What happens to the resistance of a thermistor as it increases in temperature

Answer 24

The resistance decreases as the temperature increases

Question 25

What happens to the resistance of a filament lamp as the temperature increases

Answer 25

As the temperature increases, the resistance of a filament lamp also increases

Question 26

What is the frequency and potential difference of the mains electricity supply

Answer 26

50 Hz and 230V

Question 27

why do we use step-up transformers

Answer 27

They decreases the heat loss in the cables and so this increases the efficiency - less energy is wasted when transferring electricity through the cables