Electricity (definitions)

Question 1

Coulomb

Answer 1

The charge transported by a steady current of one ampere in one second.

Question 2

Electric Current

Answer 2

The flow of charged particles.

Question 3

Conventional Current

Answer 3

Direction in which positive charges would flow In a circuit.

Question 4

Resistance

Answer 4

Potential difference/Current

Question 5

Resistivity

Answer 5

Resistivity = RA/L, where R is the resistance of the material, A is the cross-sectional area of the material and L is the length of the material.

Question 6

Ohm’s Law

Answer 6

For a metallic conductor at constant temperature, the Current in the conductor is directly proportional to the potential difference across it’s ends.

Question 7

Kirchhoff’s First Law

Answer 7

The sum of the currents entering a point is equal to the sum of current leaving the same point.

Question 8

Kirchhoff’s Second Law

Answer 8

The sum of the e.m.f’s around any closed loop in a circuit is equal to the sum of the p.d’s around the same closed loop.

Question 9

Mean Drift Velocity

Answer 9

The average distance travelled by the electrons along the wire per second.

Question 10

Kilowatt-hour

Answer 10

The energy transformed by a 1kW devise in a time of 1 hour.

J -> kWh = divided by 3,600,000
kWh -> J = multiplied by 3,600,000

Question 11

Potential Difference (p.d)

Answer 11

The energy transferred (lost) per unit charge.

Question 12

Electromotive Force (e.m.f)

Answer 12

The energy transferred (gained) per unit charge.