Electricity

Question 1

Name 4 electrical conductors

Answer 1

Copper, brass, graphite rods (carbon), steel

Question 2

Name 4 electrical insulators

Answer 2

Nylon, rubber, perspex, wood

Question 3

How do we know whether something is a conductor or insulator (what are they)

Answer 3

All things made of metal conduct electricity. There is one solid non-metal that conducts electricity- graphite. All other non-metals are insulators.

Question 4

Why are some things conductors?

Answer 4

Electrons in metals and graphite are free and can move about

Question 5

Try to draw the circuit symbols:

Answer 5

Check, did U get them right?

Question 6

What is the difference between conventional current and electron flow?

Answer 6

Electrons have negative charge, attracted to positive terminal. Electron flow- negative➡️positive. When experiments first done scientists didn’t know abt electrons- agreed to talk abt current flowing positive➡️negative - conventional current.

Question 7

What is a short circuit?

Answer 7

Electrons have to work hard to get through an obstacle e.g. bulb. If you give them an easier route, they will take this instead. Short circuits can be dangerous as without much resistance there is a very high current. This means a lot of energy can be transferred in a very short time. The cell or battery will run down quickly and the circuit might get hot and become a fire hazard.

Question 8

What is the current?

Answer 8

Current is the flow of electrons around a circuit. It is measured using an ammeter which must be connected in series with the circuit. The current will be the same all the way round a series circuit.

Question 9

What is the voltage?

Answer 9

Voltage is the difference in energy between 2 points in the circuit . It is the energy each electron has between 2 points in a circuit. It must be connected in parallel.

Question 10

Can liquids conduct electricity?

Answer 10

Yes

Question 11

What is resistance?

Answer 11

The more difficult it is for electrons to travel through a material, the bigger the resistance of the material. the resistance = voltage ÷ current: R=V/I.

Question 12

What is the unit for resistance?

Answer 12

Ohms ♎ (without line underneath)

Question 13

Do we draw a line of best fit?

Answer 13

Yes

Question 14

What is the unit for voltage

Answer 14

Volts (V)

Question 15

What is the unit for current?

Answer 15

Amps (A)