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Flashcards in P2 Electricity Deck (24)
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1
Q

Draw the symbol for an ammeter. How must an ammeter be placed in a circuit? What is it used to measure?

A

in series, used to measure current

2
Q

Draw the symbol for a voltmeter. How must a voltmeter be placed in a circuit? What is it used to measure?

A

in parallel, used to measure potential difference

3
Q

What is difference between series and parallel circuits?

A

Series ? all components in one loop. Parallel ? components in separate loops.

4
Q

What are the units for charge?

A

Coulombs (C)

5
Q

What is current? What are the units for current?

A

Rate of flow of charge, Amps (A)

6
Q

What is potential difference? What are the units of potential difference?

A

Energy transferred per coulomb of charge, Volts (V)

7
Q

What is resistance? What are the units for resistance?

A

The opposition to the flow of current, Ohms (?)

8
Q

Why does increasing temperature increase resistance?

A

Atoms in the wire vibrate more which slows the current down

9
Q

How does current behave in a series circuit?

A

It is the same all round the circuit

10
Q

How does potential difference behave in a series circuit?

A

Potential difference is shared between the components in the circuit

11
Q

How does resistance behave in a series circuit?

A

Total resistance = add up all the resistances in the circuit

12
Q

How does current behave in a parallel circuit?

A

Current is shared between the loops of the circuit

13
Q

How does potential difference behave in a parallel circuit?

A

Potential difference is the same

14
Q

How does resistance behave in a parallel circuit?

A

The more loops there are, the lower the resistance

15
Q

Describe the relationship between current and potential difference through a resistor (at a constant temperature)

A

As current increases potential difference increases.

16
Q

What is the voltage and frequency of mains electricity in the UK?

A

230V, 50Hz

17
Q

What is the difference between direct current and alternating current (A.C.)?

A

DC goes in one direction, AC rapidly changes direction

18
Q

What is the role of a fuse in the plug?

A

The fuse is a thin piece of wire which will melt if the current is too high

19
Q

What is the National Grid?

A

A series of cables and transformers to get electricity around the country (from power stations to homes and businesses)

20
Q

What do step up and step down transformers do?

A

Step up the voltage to reduce energy loss when electricity goes through the cables. Step down the voltage to make it safe in our homes.

21
Q

Draw the current-potential different graph for an ohmic resistor.

A
22
Q

Draw a resistor

A
23
Q

Draw a lamp

A
24
Q

Draw the symbol for a cell (electrical)

A