8th grade electricity and magnetism

Example

A current of 2 A flows through a 12 Ω resistor. What is the potential difference (voltage) across it, in V?

1. V = 2 × 12 = 24
2. So the answer is: 24 V

Answer: 24 V

Example

Two resistors of 8 Ω and 14 Ω are connected in series. What is their total resistance, in Ω?

1. 8 + 14 = 22
2. So the answer is: 22 Ω

Answer: 22 Ω

Example

Two lamps are connected in series to a 12 V battery. The voltage across the first lamp is 8 V. What is the voltage across the second lamp, in V?

1. 12 − 8 = 4
2. So the answer is: 4 V

Answer: 4 V