PROBLEM – 01
A 250 V electric cooking range has three
positions of switches high, medium and low. The effective resistance in three
positions are 10 ohms, 20 ohms and 40 ohms respectively. There are two identical
coils in the ranges. Show how the three position are obtained by proper
connection of the coils. Find the power consumed in each position.
PROBLEM – 02
Three resistors Ra, Rb and Rc are
connected in series to a 240 V source. If Ra = 2Rc, Rb = 3Rc and total power taken
by the circuit is 800 watts. (a) Calculate Ra, Rb and Rc (b) the power consumed
by each resistor.
PROBLEM – 03
Four resistors are connected as shown in
figure. If the power dissipated in 10 ohm resistor is 50 watts find the value
of R and total power supplied by the battery.
PROBLEM – 04
Fiver resistors are connected as shown
in figure, values of resistors are in ohms. If power dissipated in 5 ohm
resistor is 125 watts. Find the voltage drop across AB, total resistance in the
circuit and the current flow through the 15 ohm resistor.
PROBLEM – 05
Figure represents the load resistance Rl
= 80 ohms being loaded through a slide wire rheostat. The rheostat has a total
resistance of 120 ohms uniformly wound. Calculate the power dissipated to Rl
when the slide is in (a) position A, (b) moved down 1/3 from position A (c)
moved 2/3 from position A.
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