6. The figure shows a circuit. The switch s can be closed on either point A or C

Question

6. The figure shows a circuit. The switch s can be closed on either point A or C, but not both at the same time. Use the following quantities: 12 V. 1.00; 2.00 Determine the current through R1 when the switch S is closed on A. (A) 1 A (B) 2 A (C) 3 A (D) 6 A. (E) 12 A 7. The figure shows a circuit. The switch s can be closed on either point A or C, but not both at the same time Use the following quantities: 2.0 2 1.0 At what rate is energy dissipated by R1 when the switch s 15 closed on A (A) 1 W (B) W

Explanation / Answer

here,

when s is closed at A ,

R2 and R3 are in parallel

R1' = R2 * R3 /( R2 + R3)

R1' = 2*2 /( 2 + 2)

R1' = 1 ohm

Req = R1' + R1 = 2 ohm

current through R1 , I = V2/R1

I = 6 A

b)

when the switch is closed at A,

the rate at which energy dissapated by R1 , P1 = I^2 * R1

P1 = 6^2 * 1

P1 = 36 W

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