The points b and c on the diagram are the terminals of a battery with with elect

Question

The points b and c on the diagram are the terminals of a battery with with electromotive force E and internal resistance r. The circuit resistor values are shown in the figure.

(a) When an ideal voltmeter is connected between b and c it reads 12 V. What will it read if connected between a and b? Determine E of the battery?

(b) What resistance would an ohmmeter connected between points a and c read?

(c) When an ideal ammeter is inserted between points a and b it reads 0.200 A. Determine the internal resistance of the batter, r. What will this ideal ammeter read if connected between b and c?

(d) With the ammeter connected between a and b again, at what rate is thermal energy being produced inside the battery?

Explanation / Answer

R1,R2 and R3 are in series.
net resistance=R1+R2+R3=129 ohms

it is in parallel with R4.

so net resistance=39.05 ohms

Qa) as the circuit is not complete, between a and b voltage difference is infinite.(open circuit)

b)between a and c, the resistance will also be infinte.

c)12/(39.05+r)=0.2

r=20.95 ohms

if conencted between b and c, it will read 0 as and b are not connected

d)thermal energy=current^2*r=0.838 wattsa

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