Question

6. To vary the brightness of a bulb in a circuit we could use
(a) a switch (b) a variable resistor (c) a connecting wire
7 To measure the voltage across a circuit we would use
(d) an insulator​

Answer 1

Answer:

ans1) Placing cells in series increases the voltage in the circuit by 1.5 V for each cell. Increasing the voltage increases the brightness of the bulb. When a bulb in a series circuit is unscrewed all bulbs in the circuit go out. Increasing the number of bulbs in a series circuit decreases the brightness of the bulbs.

ans2) A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. An ammeter is a measuring device used to measure the electric current in a circuit.

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