Electricity

Question 1

What is electricity

Answer 1

1. Electricity is energy that flows through an electric circuit.
2. Electricity move by electric charge
3. Atoms have electric charge when they gain or lose electrons

Question 2

Static electricity definition and example

Answer 2

Energy that does not move. If built up enough it can move very quickly
EXAMPLE: lightning electric shock

Question 3

What do all electrical circuits need with examples

Answer 3

Power-supply supplies electrical energy eg battery
Load-electrical energy that is changed to another form of energy eg light heat sound
Conducting path- wires that let the electrical energy travel around the circuit.

Question 4

Electric insulator definitions and examples

Answer 4

Have low resistance they only let some electric current through with lots of loss of energy eg plastic or glass

Question 5

Battery definition

Answer 5

Battery is made of chemicals. The chemicals react to make electricity. The electrons then push then around the circuit

Question 6

Electrical current definition

Answer 6

Flow of electric charge through a circuit. How many electrons there are in the circuit. The electrons travel from the positive terminal to the negotiate terminal to the negative terminal

Question 7

Voltage definition

Answer 7

How much energy there is to push the electrons

Question 8

Resistance definitions

Answer 8

How hard it is for the electrons to flow through the parts of the circuit

Question 9

What resistance does metal have

Answer 9

Low resistance

Question 10

What resistance do insulators have

Answer 10

High resistance

Question 11

Circuit diagram definition practice the diagram by using the symbols on page 366

Answer 11

Map of an electrical circuit.

Question 12

Series circuit definition

Answer 12

All connected one after another if one globe don’t work they all don’t

Question 13

Parallel circuit definition

Answer 13

Each part is connected separately if one part don’t work the other parts will still work

Question 14

In which circuit does each globe have the same amount of brightness where they equally share the voltage

Answer 14

Series circuit

Question 15

What circuit does each globe have the same brightness as they equally share the current not the voltage

Answer 15

Parallel circuit

Question 16

Ammeter definition

Answer 16

Measures the electrical current or the number of electrons in the circuit. Measured in amps (A) or milliamps (mA)

Question 17

How many milliamps = 1 amp

Answer 17

1000

Question 18

What does a voltmeter do

Answer 18

Measures the voltage or the electrical energy it is measured in volts (V)

Question 19

What circuit do you connect the voltmeter to

Answer 19

Parallel circuit

Question 20

What are batteries

Answer 20

Batteries are portable and provide electrical energy in appliances that need to be moved around

Question 21

What is a cell made up of

Answer 21

A cell is made up of 2 electrodes and a substance through which electrical charge can flow when the 2 join together a chemical reaction occurs realising electric charge

Question 22

What are dry cells draw a dry cell page 365

Answer 22

Dry cells are normal batteries found in torches clocks smoke detectors and toys

Question 23

Conductors definition

Answer 23

Have low resistance they let lots of electric current through with little lose of energy

Question 24

Variable resistors definition

Answer 24

Change the voltage and current in a circuit eg volume dial

Question 25

How do you work out ohms law | What does each letter stand for

Answer 25

R=V/I R= resistance V= voltage I= amps

Question 26

What are 2 systematic errors

Answer 26

Reading the ammeter or volt nearer sideways instead of front on and it not being on 0 to start with

Question 26

What are 2 random errors that can occur when reading the voltmeter or ammeter

Answer 26

If you round it up or down or u change light globes when testing