P2 electricity

Question 1

Applications of componets thermister

Answer 1

Used as a circuit breaks

Question 2

Unit for mass

Answer 2

Kg

Question 3

What is the frequency of the ac mains electrical supply

Answer 3

50Hz

Question 4

Direct current

Answer 4

Current that is always in the same direction

Question 5

Battery give direct or alternating current

Answer 5

Direct

Question 6

How do you get total resistance

Answer 6

Adding the resistance of all the resistors in the circuit

Question 7

Unit for potential difference

Answer 7

Volts ,V

Question 8

Unit for current (I)

Answer 8

Amperes

Question 9

Unit for resistance (R)

Answer 9

Ohms

Question 10

what is the national grid

Answer 10

a network of transformers and transmission cables that transfers electrical power from power stations to consumers

Question 11

explain how using step-up transformers makes the network efficient

Answer 11

increase potential difference
which lowers current
and reduces energy loss

Question 12

equation linking energy transferred (E), power (p) and time (t)

Answer 12

E=P X t

Question 13

work of the stepdown transformers

Answer 13

decrease voltage so that its safe to use in house holds (230 v)

Question 14

What is current

Answer 14

Flow of charge

Question 15

What is potential difference

Answer 15

How much energy is transferred between two positions in a circuit

Question 16

Equipment used to measure potential difference

Answer 16

Voltmeter

Question 17

What does the live wire do

Answer 17

It carries the alternating potential difference between

Question 18

Job of variable resistor

Answer 18

Varys current

Question 19

What does neutral wire do

Answer 19

Completes circuit

Question 20

What does earth wire do

Answer 20

Redirects current to the ground,stop appliance from becoming live