3. In an electric circuit, a battery and a bulb
have been connected and the battery
consists of two cells of equal potential
difference. If the bulb is not glowing,
then which tests will you perform in
order to find out the reason for the bulb
not glowing?
Answers
Answer:
This would be a troubleshooting flow in order from the easiest and most obvious check to ones requiring test gear.
Visually check to make sure the batteries are connected properly; in series and not opposition. Series would be -+-+ so the voltage is additive. With a ++ or - - connection, resultant voltage will be zero.
Using a voltmeter, check voltage at bulb connection or socket. This will determine if power is available to the bulb.
If steps 1 & 2 are good, remove the bulb and check for resistance using an ohmmeter. Open or extremely high resistance indicates either an open bulb or a failure.
Explanation:
If a bulb is connected to a battery, then in the bulb the direction of current is such that it flows from negative terminal of battery to its positive terminal. Whereas inside a battery electrons flows from positive terminal to negative terminal. Also, the current will flow only in a closed loop.
It is given that bulbs A and B glow with equal brightness, when the voltage is supplied with both the batteries E1 and E2.
As the 3 bulbs are identical, the bulb connected to the switch also requires the same voltage for it to glow. But here, when the switch is closed, it forms a closed loop only with one battery. Therefore, it does not glow as the voltage is not sufficient.
Hence, when the switch is closed, A and B will maintain their brightness and C will not glow.
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