Electrons

Question 1

Potential Difference

Answer 1

The electrical energy transferred per unit charge when electrical energy is converted into another form

Question 2

Volt

Answer 2

Unit of potential difference

1V = 1JC-1

Question 3

Electromotive Force

Answer 3

The electrical energy transferred per unit charge when one from of energy is converted into electrical energy

Measured in volts

Question 4

Resistance

Answer 4

The ratio of voltage across a component to the current going through it

Question 5

Ohm

Answer 5

Unit of resistance

1 ohm = 1VA-1

Question 6

Ohms law

Answer 6

The electric current through a conductor is proportional to the potential difference across it providing physical conditions (eg temp) remain constant

Question 7

Resitivity

Answer 7

The ratio of the product of resistance and cross sectional area of a component and its length

Question 8

Power

Answer 8

Rate of energy transfer

Question 9

Kilowatt-hour

Answer 9

Unit of energy used by electrical companies when charging for electricity

1kWh = 1000W for 3600s

Question 10

Kirchoffs first law

Answer 10

The sum of the currents entering any junction is always equal to the sum of the currents leaving the junction

Question 11

Kirchoffs second law

Answer 11

The sum of the emfs is equal to the sum of the pds in a closed loop

Question 12

Coulomb

Answer 12

Unit of electric charge
1C = 1A x 1s

Charge of an electron 1.6x10-19C