Question:
A3ohm, a 5ohm and a 4ohm resistor are connected in series across a battery. The voltage drop across a 3ohm resistor is 6V. What is the battery
voltage?
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6
Answer:
total resistance of series =R1+R2+R3
effective resistance=30+50+40= 120 ohm
we know om's low V=I*R
where v is voltage
I is current
R is resistance
current in series will be same for all the resistors
at 30 ohm resistor
6volt =I*30ohm
so I= 1/5 amp
for the total resistance the voltage will be voltage at battery
so
Voltage at battery = (1/5)*120 = 24 volt
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