Kakaj

Question 0

What is current?

Answer 0

Current is the rate of flow of charge around a circuit

Question 1

What is electric current?

Answer 1

A flow of charge round a circuit

Question 2

What is voltage? ( potential difference)

Answer 2

Voltage is an electrical pressure giving a measure of the energy transferred

Question 3

Whats the main electricity supply in peoples homes?

Answer 3

Alternating current - it reverses is direction back and forth.

Question 4

What is an alternating current? (A.c)

Answer 4

An alternating current is a wave/ wiggly

Question 5

What can the CRO show?

Answer 5

CRO can show current as a trace on a graph

Question 6

What direction does direct current go in? (D.c)

Answer 6

Direct current always flows in the same direction

Question 7

The CRO trace is a ……?

Answer 7

Horizontal line

Question 8

What do you get direct current from?

Answer 8

Batteries and solar cells

Question 9

What are electrons?

Answer 9

Negatively charged particles

Question 10

What is electrical power?

Answer 10

Electrical power is the energy transferred per second

Question 11

What are the units of power?

Answer 11

Watts (W)

Question 12

If you measure the current and voltage what can you tell?

Answer 12

The power.

Question 13

What does a voltmeter do?

Answer 13

Measures the voltage across the component

Question 14

Whats the formula for calculating the power of the component?

Answer 14

Power= current x voltage
(watts). (Amps). (Volts)
W. A. V
I

Question 15

How do you work out voltage?

Answer 15

Power divided by current

P. I.

Question 16

What is electromagnetic induction?

Answer 16

Creating a voltage and maybe a current in a conductor by moving a magnet in or near a coil of wire.

Question 17

If you want a bigger peak voltage ( and current) you have to increase what?

Answer 17

One of these four things; 
1- the strength of the the magnet 
2- the area of the coil
3- the number of turns on the coil
4- the speed of the movement

Question 18

How do generators work?

Answer 18

By rotating a magnet or a coil of wire.

Question 19

What is non- renewable energy?

Answer 19

Energy that will run out one day.

Question 20

What are the Non- renewable energy resources?

Answer 20

1- coal
2- oil
3- natural gas
4- nuclear fuels

Question 21

What do power stations use to drive a turbine?

Answer 21

Steam

Question 22

Renewable energy resources will never run out. True or false?

Answer 22

True

Question 23

What does hydroelectric power usually involves?

Answer 23

Flooding a valley by building a bid dam.

Question 24

What can waves provide?

Answer 24

Waves can provide an up and down motion which can be used to drive a generator.