Pearson Edexcel IGCSE · Physics
3 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Energy and voltage in circuits.
Two identical resistors are connected in parallel to a battery. If the voltage across the battery is \(V\) and the current leaving the battery is \(I\), which statement is correct regarding the voltage and current for each resistor?
A specific component is placed in a circuit. When the intensity of light falling on the component increases, the current in the circuit is observed to increase. Identify the component and explain the change in its resistance.
A lamp is connected to a power supply with a potential difference of \(12 \text{ V}\). A current of \(0.50 \text{ A}\) flows through the lamp for \(2.0 \text{ minutes}\). Calculate the total energy transferred to the lamp.
State the relationship between energy transferred, charge, and voltage, and define what a volt is in terms of energy and charge.
Write your answer out first, then check it against the worked solution.
A charge of \(30 \text{ C}\) flows through a filament bulb in \(2 \text{ minutes}\). If the potential difference across the bulb is \(6 \text{ V}\), calculate the total energy transferred during this time.
Write your answer out first, then check it against the worked solution.
Explain why the total resistance of a circuit decreases when a second resistor is added in parallel to an existing resistor.
Write your answer out first, then check it against the worked solution.
Domestic lighting systems are usually connected in parallel circuits rather than series circuits.
(a) Provide two reasons why a parallel circuit is more appropriate for lighting in a house.
(b) State what happens to the total resistance of the circuit when an additional lamp is switched on in parallel.
Write your answer out first, then check it against the worked solution.
An electrical component in a circuit has a potential difference of \(9.0 \text{ V}\) across it and a steady current of \(0.20 \text{ A}\) flowing through it.
(a) Calculate the total electrical charge that passes through the component if it is left on for \(5.0 \text{ minutes}\).
(b) Determine the total energy transferred to the component during this time interval.
Write your answer out first, then check it against the worked solution.
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