An ammeter must be connected in series and should have
Correct answer: B. very low resistance, so it hardly alters the current it measures
- A. very high resistance
- B. very low resistance, so it hardly alters the current it measures
- C. infinite resistance
- D. the same resistance as the circuit
Explanation
Since the whole current flows through it, any appreciable resistance would reduce that current and falsify the reading, so an ideal ammeter has zero resistance. A voltmeter is the opposite case: connected in parallel, it should have very high resistance so it draws almost no current from the branch it is measuring. Connecting an ammeter in parallel across a supply is close to a short circuit and can destroy it.
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Steady current is the continuous flow of charge at a constant rate through a conductor. The topic covers current, charge, potential difference, resistance, Ohm's law, resistivity and electrical power, along with series and parallel circuits, while distinguishing conventional current direction from electron motion.
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