Two lightbulbs, one rated 30W and 120V another rated 40W and120V are arranged in

Question

Two lightbulbs, one rated 30W and 120V another rated 40W and120V are arranged in two different circuits. a) the two bulbs are first connected in parallel to a 120 Vsource Determine resistance of bulb rated 30W and the current in itwhen connected in this circuit. b) The bulbs are now connected in series with each other and a120V source Determine the resistance of the bulb rated 30W and the currentin it when it is connected in this circuit. Two lightbulbs, one rated 30W and 120V another rated 40W and120V are arranged in two different circuits. a) the two bulbs are first connected in parallel to a 120 Vsource Determine resistance of bulb rated 30W and the current in itwhen connected in this circuit. b) The bulbs are now connected in series with each other and a120V source Determine the resistance of the bulb rated 30W and the currentin it when it is connected in this circuit.

Explanation / Answer

Let R1 and R2 be the resistance of two bulbs respectively. R1=U1^2/W1=480 () R2=U2^2/W2=360 () a) I1=U1/R1=0,25(A) and R1 = 480 b) the resistance of the first bulb still is 480 I=2*U/(R1+R2)=0,285(A)

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