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Voltage and Resistance Video Lecture | Year 9 Physics (Cambridge)

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FAQs on Voltage and Resistance Video Lecture - Year 9 Physics (Cambridge)

1. What is voltage?
Ans. Voltage is the measure of the electric potential difference between two points in a circuit, representing the force that pushes electric charges through the circuit.
2. How is voltage measured?
Ans. Voltage is measured in volts using a voltmeter, which is connected across the points where the potential difference needs to be measured.
3. What is resistance?
Ans. Resistance is the measure of opposition to the flow of electric current in a circuit, caused by the material of the conductor and its dimensions.
4. How is resistance calculated in a circuit?
Ans. Resistance in a circuit is calculated using Ohm's Law, which states that resistance (R) equals the voltage (V) divided by the current (I), expressed as R = V/I.
5. How does resistance affect voltage in a circuit?
Ans. In a circuit, resistance causes a drop in voltage as current flows through it, leading to a decrease in the potential difference between points in the circuit.
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