CIE iGCSE Co-Ordinated Science P4.3.1 Circuit diagrams and circuit components Exam Style Questions Paper 2
▶️ Answer/Explanation
An ammeter must be connected in series with the lamp to measure current through it. A voltmeter must be connected in parallel across the lamp to measure p.d. across it.
✅ Answer: (C)
✅ Answer: (C)
▶️ Answer/Explanation
The lamp lighting briefly then going off, and never lighting again after the switch is reopened and closed, is the classic behaviour of a fuse blowing.
A fuse melts and permanently breaks the circuit once, unlike a switch, resistor or diode, which would not behave this way.
✅ Answer: (A)
A fuse melts and permanently breaks the circuit once, unlike a switch, resistor or diode, which would not behave this way.
✅ Answer: (A)
▶️ Answer/Explanation
An ammeter must be connected in series in the main circuit loop so that the full current flowing through the resistor also flows through it.
A voltmeter must be connected in parallel across the resistor, so it measures the potential difference between its two ends without diverting current from the main circuit.
Only one circuit diagram shows the ammeter in series and the voltmeter in parallel in this way.
✅ Answer: (A)
A voltmeter must be connected in parallel across the resistor, so it measures the potential difference between its two ends without diverting current from the main circuit.
Only one circuit diagram shows the ammeter in series and the voltmeter in parallel in this way.
✅ Answer: (A)
Question
A student connects the circuit shown.
When the switch is closed, the fuse blows and stops the current.
What is a possible reason for this?
(A) The current rating of the fuse is too high.
(B) The current is too large.
(C) The lamp is too dim.
(D) The voltage is too small.
▶️Answer/Explanation
Ans: B