Edexcel IGCSE Physics 2.21 Energy Charge and Voltage Questions

Energy transferred equals charge multiplied by potential difference. Rearrange E = QV to find a missing quantity and convert prefixes before calculating.

Exam points

convert kV, mC or μC into base units before using E=QV
rearrange E=QV to calculate charge or potential difference from energy data
combine Q=It with E=QV when current and charging time are also supplied

[Maximum number: 2]

The student extends the investigation by recording additional data for the lamp.

This is her method.
For each voltage
- switch the current on for 45 seconds
- record the current and colour of the lamp
- calculate the power and the energy transferred by the lamp

The table shows the student's results.

Table for Question Edexcel IGCSE Physics 2.21 Energy Charge and Voltage Questions question 1 — Edexcel IGCSE Physics

Calculate the missing value of energy for the voltage of 4.0 V.

Give your answer to 2 significant figures.

energy = .......... J

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Edexcel IGCSE Physics 2.21 Energy Charge and Voltage Questions question 1