Q1
The SI unit of electric current is the:
Aampere
Bvolt
Cohm
Dwatt
CBSEClass 10 (CBSE)ScienceCh 11 · Topic 1
Electric Current and Potential Difference
Learning the basic quantities describing electric current in a circuit.
Core concept
Current flows from a region of higher potential to lower potential within an external circuit, driven by a cell or battery that maintains this potential difference through chemical energy conversion. A galvanometer detects the presence and direction of small currents, while an ammeter (connected in series) measures current magnitude, and a voltmeter (connected in parallel) measures potential difference across a component — each instrument designed for its specific measurement role in a circuit.
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• Electric current (I) = Q/t, measured in amperes (A).
• Potential difference (V) is the work done per unit charge, measured in volts (V).
• Current flows from higher to lower potential in an external circuit, driven by a cell/battery.
• Ammeter (series) measures current; voltmeter (parallel) measures potential difference.