Question

6. several light bulbs are connected in series across a 115 v source

of emf.
a. what is the equivalent resistance if the current in the circuit is 1.70 a?
b. if each light bulb has a resistance of 1.50 ohms, how many light bulbs are
in the circuit?

Answer 1

Step-by-step explanation:

a) I = V / R

1.70 = 115 / R

R = 115 / 1.70

R = 67.647

R = 67.65 ohms

Therefore, equivalent resistance is 67.65 ohms

b) Equivalent resistance of circuit from above sum is 67.65 ohms

Given resistance of each bulb is 1.50 ohms

Number bulbs = Equivalent resistance / Resistance of each bulb

= 67.65 / 1.50

= 45