Circuits CIRCUIT ORCUT2 CIRCUIT 3 CIRCUIT 1. In circuit 1, which (if either) is

Question

Circuits CIRCUIT ORCUT2 CIRCUIT 3 CIRCUIT 1. In circuit 1, which (if either) is bigger: The current through wire A or the current through wire B? What gets "used up when current flows through a light bulb? 2. When circuit 1 is transformed into circuit 2 (by hooking up the 2nd light bulb), what happens to (a) The brightness of light bulb 1? (b) The current through wire A? Why? 3. When circuit is transformed into circuit 3, what happens t (a) The brightness of bulb 1? (b) The curent though wire A? (c) The current through wire B? Explain all your answers. If the experiment comes out different from your prediction, you can amend your answer by trying to explain the discrepancy 4. (This one is hard, but very important.) When circuit 2 is transformed into circuit 4 (by hooking up the third bulb), what happens to (a) The current through wire A? (b) The brightness of bulb 1? (c) The brightness of bulb 2? Explain your answers conceptually (not just with formulas). Check your answers with your TA. 5·Leth denote the current through wire A in circuit I. In terms ofl, what is the current through wire A in. (a) sicuit 2? Is it 21, or I/2, or what? Explain conceptually, even if you know a formula. (b) sircuit 3? Explain (c) (harder) circuit 4? Explain.

Explanation / Answer

1)

For circuit one current in both the wires is same

2)

brightness of bulb one decreases as the resistance of circuit increased so current in circuit decreases

current in wire A decreases as resistance of wire decreases

3)

a)

doesnt change as voltage across bulb A is not changing

b)

current through wire A increases as resistance of circuit decreased

c)

current through wire B is not changed as voltage across A is not changing

4)

a ) increases as resistance of circuit decreases

b) increases

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