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  • (a) Two lamps rated and <img alt="10\; W,\; 220\; V" src="http://entrancecorner.codecogs.com/gif.latex?%5Cinline%2010

(a) Two lamps rated 100\; W,\; 220\; V and 10\; W,\; 220\; V are connected in parallel to 220\; V supply. Calculate the total current through the circuit. (b) Two resistors X and Y of resistances 2\; \Omega and 3\; \Omega respectively are first joined in parallel and then in series. In each case the voltage supplied is 5\; V. (i) Draw circuit diagrams to show the combination of resistors in each case. (ii) Calculate the voltage across the 3\; \Omega resistor in the series combination of resistors.
 

Answers (1)

(a)   I1 = P1/V

I1 = 100 W/ 220 V = 10/  22 A

I2 = P2 / V = 10/ 220 = 1/ 22 A

I = I1 + I2 = = 0.5 A

(b)

(i) Circuit diagrams to show the combination of resistors in each case- 

(ii) Net R=R1+R2=2+3=5 ?

I = V/ Rnet = 5 / 5 = 1A

∴ Voltage across 3? resistor - 

∴ V = 1 × 3 = 3V

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Safeer PP

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