A circuit has one battery and two bulbs in series. A third bulb is added the cir

Question

A circuit has one battery and two bulbs in series. A third bulb is added the circuit, also in series. Which statement is true? the voltage drop on the bulbs increases and the current out of the battery stays increases the voltage drop on the bulbs increases, but the current out of the battery stays constant the voltage drop on the bulbs decreases, but the current out of the battery stays constant the voltage drop on the bulbs decreases and the current out of the battery decreases The sum of the currents into a junction equals the sum of the currents out of the junction" is a consequence of. Newton's third law Ohm's law conservation of charge conservation of energy conservation of momentum

Explanation / Answer

power of each bulb P = V*i

for n bulbs

n*P = V*I

n*300 = 120*15

n = 6

6 bulbs can can be connected paralle to 120 V

+++++++++++++

total resistance = Req = V/I = 120/15 = 8

Req = R/n

R = resistance of each bulb

R = Req*n = 48 ohms

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