# A B C D Which bulb is brightest? 1. All are equally bright 2. A and B ```Circuit Problems P 5
May 28, 2013
B
A
Bulbs A, B, C and D are identical
D
C
Which bulb is brightest?
1. All are equally bright
3. Bulb C is brightest
2. A and B are brightest
4. Bulb is D are brightest
5. None of the above
Circuit Problems P 5
Hints:
to solve this you need to determine how V and I
compare for each bulb
thinking about equivalent resistance - Req - helps
Hint 1: Why is the current through bulb D greater than
through bulbs A, B or C? Rank the current from highest
to lowest.
Hint 2: If the current through bulb C must be less than the
current through bulb D, is the voltage also less? Explain
May 28, 2013
Circuit Problems P 5
May 28, 2013
Circuit Problems P 5
May 28, 2013
Circuit Problems P 5
May 28, 2013
All resistors are 4 Ohms
1. Find R eq for R1, R2, R3
2. Find total R eq
R2
3. Find I
R3
4. Find V across R1 and
V across R4
R1
8V
R4
Circuit Problems P 5
May 28, 2013
Circuit Problems P 5
May 28, 2013
Circuit Problems P 5
May 28, 2013
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