Unit 2: Electrical Quantities and Ohm’s Law

Question 1

What is a coulomb?

Answer 1

The coulomb is a measure of charge. 1 coulomb is equal to 6.24 x 10^18 electrons.

Question 2

What is an ampere?

Answer 2

The ampere is a measurement of the amount of electricity that is flowing through a circuit. The ampere (A) is equal to 1 coulomb per second.

Question 3

Define voltage.

Answer 3

Voltage is defined as the potential difference between two points of a conducting wire carry- ing a constant current of 1 ampere when the power dissipated between these points is 1 watt. Voltage is also referred to as potential difference or electromotive force (EMF).

Question 4

Define ohm.

Answer 4

An ohm (Ω) is the unit of resistance to current flow. An ohm is the amount of resistance that allows 1 ampere of current to flow when the applied voltage is 1 volt.

Question 5

Define watt.

Answer 5

Wattage is a measure of the amount of power that is being used in a circuit.

Question 6

What is Ohm’s Law?

Answer 6

E = I x R Voltage = Current x Resistance

Question 7

What is Power Law?

Answer 7

P = I x E Power = Current x Voltage