Question

To lamps of rating 220 V, 60 W and 220 V, 100 W are
connected in series across 220 V supply. Calculate the voltage
across each lamp and power consumption. What will be the
power consumption, if the two lamps are connected in parallel?
​

Answer 1

Answer:

Explanation:

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In case of Bulb 1

Potential difference,V1= 220v

Power,P1 = 100w

In case of Bulb 2

Potential Difffernce,D2 =220v

Power,P2 = 60w

Now, since they are connected in parallel combination hence they have same potential difffernce and the total Current in the circuit is given the sum of currents flowing in both the resistors.

Power = Potential difference×Current

=>P = V×I

=>I= P/V.

Now,In case of Bulb 1

I1 = 100/220

=> I1 = 5/11 watts ------------(i)

Now,in case if bulb 2

I2 = 60/220

=>I2= 3/11watts ---------------(ii)

From (i) and (ii) we get=>

Total Current in circuit,(I)n=>

(I)1 + (I)2

=>(3/11)+(5/11)

=>8/11 watts.

Hence, the current in the circuit is 8/11 watts or 0.73 watts.

Remember

1)Ohm's law of resistance

V=I×R

2) Power = Work/Time

or

Power = V×I = I^2×R

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Answer 2

Explanation:

every information asked in question is solved in attachment....

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