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Physics revision GCSE > Electricity > Flashcards

Electricity Flashcards

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1
Q

How do you work out resistance?

A

Resistance(ohms)= voltage (v) % current (amps)

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1
Q

What is the unit for resistance

A

Ohms

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2
Q

Why do circuits heat up?

A

The collisions increase due to more current moving around the wire which causes it to create more energy and be transferred to heat energy.

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3
Q

Two types of circuit structure?

A

Parallel and series

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4
Q

What are some qualities of a series circuit?

A

Closed circuit
Single path
If blocked it will stop the circuit

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5
Q

What are some qualities of a parallel circuit?

A

Open circuit
Multiple paths
If one route is blocked the current will flow somewhere else

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6
Q

What is AC?

A

Alternating current (current is always changing from positive to negative)

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7
Q

What is DC?

A

Direct Current (cells and batteries supply this and it only goes in one direction)

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8
Q

What are the three types of wire?

A

Neutral
Earth
Live

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9
Q

What is the point of the Live wire

A

CarrY alternating current

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10
Q

What is the point of a neutral wire

A

Complete the circuit

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11
Q

What is the point of an earth wire

A

Safety wire to prevent the live from getting to dangerous by transferring electricity to the ground where it diffuses safely

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12
Q

What is power (electricity)

A

The amount of energy transferred per second

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13
Q

What do transformers step up/down?

A

Voltage

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14
Q

Why do we want less current in transformers?

A

To prevent them melting the wires and not to waste energy

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15
Q

Why do step up transformers increase voltage?

A

To increase the amount of electricity that can be transferred at a time

16
Q

Why do step down transformers reduce voltage

A

To make it safe for homes as most home appliances only require low voltage

17
Q

What is static charge?

A

Transfer of electrons form one material to another

18
Q

What happens when two insulators rub against each other?

A

They transfer electrons and create a positive and negative charge which creates an electrical field

19
Q

Can charge be created?

A

No it is only moved form one object to another

20
Q

What is the equation for Power?

A

Power(watts) = Current (amps) x Voltage (V)
OR
power(watts) = Current 2 (amps) x resistance (ohms)

Physics revision GCSE (10 decks)

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