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Question
A circuit consists of a battery, a resistor R and two light bulbs A and B as shown. If the filaments in light A burns out, then the following is true for light bulb B :
A circuit consists of a battery, a resistor R and two light bulbs A and B as shown. If the filaments in light A burns out, then the following is true for light bulb B :
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Solution
The correct option is D It gets brighter
Answer is D.
Components connected in parallel are connected so the same voltage is applied to each component. In a parallel circuit, the voltage across each of the components is the same, and the total current is the sum of the currents through each component.
If one of the components in the parallel connection goes wrong, the other components will function without any hindrance.
Increasing the current increases the brightness. However, P = IV, so you could increase either one.
In this case, the bulb A goes out, the total current passes through the second bulb B, which increases the power and hence the brightness.
Hence, the light bulb B gets bighter.
Answer is D.
Components connected in parallel are connected so the same voltage is applied to each component. In a parallel circuit, the voltage across each of the components is the same, and the total current is the sum of the currents through each component.
If one of the components in the parallel connection goes wrong, the other components will function without any hindrance.
Increasing the current increases the brightness. However, P = IV, so you could increase either one.
In this case, the bulb A goes out, the total current passes through the second bulb B, which increases the power and hence the brightness.
Hence, the light bulb B gets bighter.
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