Electricity

Question 1

Current

Answer 1

The rate of flow of charge

Question 2

The potential difference

Answer 2

Work done per unit charge moved

Question 3

Thermistors and LDRs

Answer 3

Increasing the temperature of a
thermistor decreases its resistance but doing the same for a normal
metal conductor increases its resistance.
Increasing the light intensity on an LDR decreases its resistance.

Question 4

Superconductors

Answer 4

Superconductors are materials which have zero resistivity at and below a critical temperature which depends on the material

Question 5

Volt

Answer 5

The potential difference across a component is 1 volt when you convert 1 joule of energy moving per coulomb of charge through the component

Question 6

Ohm’s Law

Answer 6

Ohm’s Law states that the potential difference across a conductor is proportional to the current flowing through it

Question 7

Ohmic conductors and non ohmic resistors

Answer 7

Ohmic conductors are conductors which obey Ohm’s law, the current through an ohmic conductor is directly proportional to the potential difference across it given that the physics conditions such as temperature is constant.
A non ohmic resistor does not have a constant resistance

Question 8

Power

Answer 8

The rate of transfer of energy. Units: Watts(W)

Question 9

E.m.f

Answer 9

Electromotive force can be defined as the total amount of energy supplied by the cell per coulomb of charge which flows.

Question 10

One coulomb

Answer 10

The amount of charge that passes in one second if the current is 1 ampere