Answer to Question #301217 in Electrical Engineering for syra

Question

115V incandescent lamps A and B are connected in series across a 230V

source. If lamp A is rated 75watts and lamp B is rated 50watts, determine

the current drawn by the series connection.

Answer 1

A is rated 75watts and lamp B is rated 50watts

P₁= V₁I₁= 75=115*I₁

I₁= 1.533 A

R1= 115/1.533 = 75.016 ohm

P2= V2I2= 50=115*I2

I2= 0.434 A

R2= 115/0.434=264.976 ohm

Total Resistance =339.976

Current in circuit = 230/ 339.976= 0.67666 A