The device used to measure current in a circuit is
A. Potentiometer
B. Ammeter
C. Voltmeter
D. Galvanometer
Answer: Option B
Solution (By JKSSB Mock Tests)
Ammeter measures current. Galvanometer detects presence and direction of small currents, can be calibrated as ammeter/voltmeter. Voltmeter measures voltage. Potentiometer measures emf precisely.
Explanation:
1 kWh = 1000 W × 3600 s = 3,600,000 J = 3.6 × 10⁶ J. This is a standard conversion. Power (watt) × time (hour) gives energy. 1 watt = 1 J/s. Remember this for electricity bills.
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