Question
Sun February 10, 2013

# A copper voltmeter and a bulb of rating 100 W-220V are connected in series across a dc source.if 0.198g of copper is deposited on the electrode in 40 minutes,calculate potential difference across the bulb assuming that its resistance is constant.ECE of calcium=0.00033g/c.

Mon February 11, 2013
m=Zit
Putting the values find out i.
then that would be the current in bulb as well as the voltmeter as they are connected in series.
Now find resistance of bulb from formula :P=V2/R,putting P=100W and V=220V
then the voltage across bulb=iR
Related Questions
Wed January 18, 2017

# A cell of emf E and internal resistance r is connected to two external resistance R1 and R2 and a perfect ammeter.The current in the circuit is measured in four different situation: (i)without any external resistance in the circuit (ii)with resistance R1 only (iii)with Ri and R2 in series combination (iv)with R1 and R2 in parallel combination The currents measured in the four cases are 0.42A,1.05A,1.4A and 4.2A,but not necessarily in that order.Identify the currents corresponding to the four cases mentioned above.

Thu November 24, 2016