Topic 2 : Electricty

Question 1

What does it mean when there is a higher potential difference being moved round in a circuit?

Answer 1

The more energy transfers to the circuit

Question 2

What is potential difference measured by?

Answer 2

Volts (V)

Question 3

What’s another name for potential difference?

Answer 3

Voltage

Question 4

What is resistance?

Answer 4

How difficult it is for current to flow

Question 5

What does it mean when there is higher resistance in a circuit?

Answer 5

The harder it is for current to flow through the comment

Question 6

What is resistance measured in?

Answer 6

ohms

Question 7

What does the symbol I stand for?

Answer 7

Current

Question 8

What is current measured in?

Answer 8

Amps (A)

Question 9

What does LED stand for?

Answer 9

Light-emitting diode

Question 10

What does LDR stand for?

Answer 10

Light-dependent resistor

Question 11

What is the electric current?

Answer 11

The flow of electrical charge

Question 12

What is the unit of charge?

Answer 12

Coulombs (C)

Question 13

What is the unit of time?

Answer 13

Seconds (s)

Question 14

What does a circuit mean?

Answer 14

A closed loop that an electrical current can flow through

Question 15

What are the two type of circuits?

Answer 15

Series
Parallel

Question 16

Where does electricity come from?

Answer 16

An ac or dc power supply

Question 17

What does dc stand for?

Answer 17

Direct current

Question 18

What is the result of of a direct current?

Answer 18

The current only flows in one direction

Question 19

What does ac stand for?

Answer 19

Alternating current

Question 20

What does alternating current mean?

Answer 20

The potential difference alternates quickly between positive and negative

Question 21

What does the ac current produce?

Answer 21

regularly changes direction

Question 22

Is mains electricity ac or dc?

Answer 22

ac

Question 23

In the uk mains electricity has frequency and potential difference of what?

Answer 23

Frequency = 50 Hz
Potential difference = 230 V

Question 24

What does the (brown) live wire do?

Answer 24

Carries the alternating potential difference from the power supply

Question 25

What does the (blue) neutral wire do?

Answer 25

Completes the circuit

Question 26

What is the (green and yellow) Earth wire?

Answer 26

A safety wire that prevents the case of the applicant from becoming charged

Question 27

What does bigger the current mean?

Answer 27

The greater the power transferred

Question 28

What is the national grid?

Answer 28

A system of cables and transformer across the country that links power station to consumers

Question 29

What do the transformers do?

Answer 29

Change the potential difference and the current of an perri city supply

Question 30

What are step-up transformers?

Answer 30

They increase the potential difference and decrease the current

Question 31

What are the step - down transformers?

Answer 31

Decrease the potential difference, making it safer for consumers

Question 32

What examples of domestic use of electricity?

Answer 32

Lighting Heating Cooking