Question 1

What is an electric current?

Accepted Answer

A flow of charge.

Answer

A flow of electrons

Question 2

Why do metals conduct electricity?

Accepted Answer

They contain lots of electrons that are delocalised which can move and carry charge.

Answer

They contain lots of positive ions that are delocalised which can move and carry charge.

Question 3

What does  a big electric current mean?

Accepted Answer

There is a bigger number of electrons that pass through a component each second.

Answer

There is a smaller number of electrons that pass through a component each second.

Question 4

What is voltage  measured in?

Accepted Answer

Volts (V)

Answer

Coulombs (C)

Answer

Amps (A)

Question 5

What is electric charge measured in?

Accepted Answer

Coulombs (C)

Answer

Volts (V)

Answer

Amps (A)

Question 6

What is current  measured in?

Accepted Answer

Amps (A)

Answer

Volts (V)

Answer

Coulombs (C)

Question 7

Charge flow =

Accepted Answer

Current x time taken

Question 8

What is a diode?

Accepted Answer

It only allows current to flow in one direction.

Answer

It allows current to flow in two directions.

Question 9

Which device measures the current in a circuit?

Accepted Answer

Ammeter - it must be connected in SERIES

Answer

Voltmeter - it must be connected in PARALLEL

Question 10

What is the meaning of potential difference (p.d. or voltage)?

Accepted Answer

This is the energy transferred/work done by each of coulomb of charge that passes through a device.

Answer

This is the energy transferred/work done by each of ammeter of charge that passes through a device.

Question 11

Potential difference =

Accepted Answer

energy transferred / charge

Answer

energy transferred x charge

Question 12

What is resistance?

Accepted Answer

Metal atoms resist the passage of electrons through the torch bulb.

Answer

Non Metal atoms resist the passage of electrons through the torch bulb.

Question 13

Resistance is measured in

Accepted Answer

Ohms

Answer

Volts

Answer

Coulombs

Question 14

Resistance =

Accepted Answer

potential difference / current

Answer

potential difference x current

Question 15

For a given potential difference, the larger the resistance of a resistor

Accepted Answer

the smaller the current

Answer

the larger the current

Question 16

What is Ohm's law?

Accepted Answer

the current through a resistor at constant temperature is directly proportional to the potential difference across the resistor

Answer

the current through a resistor at constant temperature is inversely  proportional to the potential difference across the resistor

Question 17

What is an ohmic conductor?

Accepted Answer

A device through which resistance is constant as the current changes, as long as temperature is constant. e.g. a wire

Answer

A device through which resistance is constant as the current changes.

Question 18

What is the current potential difference graph for an ohmic conductor?

Accepted Answer

It is a straight diagonal line - directly proportional.

Answer

In the forward direction, the line curves towards the y-axis. So the current is not directly proportional to the potential difference. In the reverse direction, the current is virtually zero.

Answer

It is a stretched out S shape

Question 19

What is a light emitting diode?

Accepted Answer

A diode that emits light when a current passes through it in the forward direction.

Answer

A diode which only allows current through in one direction.

Question 20

What is a light dependent resistor?

Accepted Answer

If light intensity increases the resistance decreases

Answer

If light intensity decreases the resistance decreases

Question 21

What is a thermistor?

Accepted Answer

If the temperature increases the resistance decreases

Answer

If the temperature decreases the resistance decreases

Question 22

What is current like in different points of a parallel circuit?

Accepted Answer

The current is shared across each component

Answer

The current is the same across each component

Question 23

What is potential difference in different points of a series circuit?

Accepted Answer

The potential difference is shared between the components in the circuit

Answer

The potential difference is the same between the components in the circuit

Question 24

How to calculate the total resistance in a series circuit?

Accepted Answer

The sum of the resistance of each component

Answer

The sum of the reciprocal resistance of each component

Question 25

What is current like in different points of a series circuit?

Accepted Answer

The current is the same across each component

Answer

The current is shared across each component

Question 26

What is potential difference in different points of a series circuit?

Accepted Answer

The potential difference is the same between the components in the circuit

Answer

The potential difference is shared between the components in the circuit

Question 27

The bigger the resistance of a component

Accepted Answer

The smaller the current

Answer

The bigger the current

Question 28

How to calculate the total resistance in a series circuit?

Accepted Answer

The sum of the reciprocal resistance of each component

Answer

The sum of the resistance of each component

Question 29

What is the total of different components in parallel like?

Accepted Answer

Less than the resistance of the resistor with the least resistance

Answer

More than the resistance of the resistor with the least resistance

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