A technician investigates the potential difference (voltage) across an electrical heater - Edexcel - GCSE Physics - Question 4 - 2015 - Paper 1

To calculate the potential difference (V) across the heater, we can use Ohm's law, which states: $V = I \times R$ where:

• $I$ is the current (0.56 A)
• $R$ is the resistance (15 Ω)

Substituting these values into the formula, we get: $V = 0.56 \text{ A} \times 15 \text{ Ω}$ Performing the calculation: $V = 8.4 \text{ V}$ Thus, the potential difference across the heater is 8.4 V.