letely fills the J. (a) What is Three different light bulbs (RA > Ra> Re) are co
ID: 2035047 • Letter: L
Question
letely fills the J. (a) What is Three different light bulbs (RA > Ra> Re) are connecied in to an ideal battery (internal resistance is negligible) Q6: If the switch is closed, the total resistance of the cireuit a. increases decreases c. remains the same Q7: What happens to the brightness of the bulb A when the switch is closed? a. increases b. decreases remains the same 08: Compare the brightness of A andB b. B is brighter than A. a.A is brighter than B. d. More information is needed. c. Both are equally bright.Explanation / Answer
1. (B)Before closing the switch, the total resistance of the circuit was RA + RB
Once the switch is closed, a new resistance RC is added in partake to the initial circuit. Since additional of a parallel resistance decreases the equivalent ressistare, the total resistance decreases.
2(c). Across the combination of A and B, potential difference remains unchanged by closing the switch, so the current that flows in the resistor A is same as before. Brightness depends upon the power consumption I2R. Since I is same as before and so does the power. Thus the brightness of A remains unchanged
3. (A)Brightness depends on power I2R
both a and b have the same current
Since the resistance of A is greater than the resistance of b
A will consume more power and A will be brighter
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