Definitions

Question 1

Electromotive force

Answer 1

Amount of electrical energy produced by a battery/source per unit of charge

Question 2

Power

Answer 2

Rate of transfer of electrical energy to a component per second

Question 3

Resistance

Answer 3

P.d/I i.e. The electrical energy used when a current of 1 amp moves through a component

Question 4

Pd

Answer 4

The amount of electrical energy converted or transferred per unit of charge between 2 points

Question 5

Ohms law

Answer 5

The current passing through a conductor is proportional to the voltage as long as the physical conditions do not change

Question 6

Resistivity

Answer 6

The resistance of a 1m^2 cross section conductor with a length of 1m

Question 7

Critical/Transition temperature

Answer 7

The temperature that below which a superconductor has no resistance and very large currents can pass through with v small voltage/energy loss

Question 8

Internal resistance

Answer 8

An electrical source of cell’s opposition to the flow of charge through it, defined as the loss if pd per unit current when a current passes through the source/cell

Question 9

Isotopes

Answer 9

Nuclides with the same number of protons but different number of neutrons

Question 10

Pair production

Answer 10

When a particle and It’s corresponding antiparticle are produced from a photon with energy greater than the total rest energy of the two particles

Question 11

Annihilation

Answer 11

When a particle and It’s corresponding antiparticle collide they annihilate. Their kinetic energies and rest energies are converted into 2 high energy photons with energy E=hf