an electric lamp of 60 ohm toaster of 30 ohms are connected in parallel to a 20 v source - Science - Electricity

Question

an electric lamp of 60 ohm &toaster of 30 ohms are connected in
parallel to a 20 v source of electricity a ) what will be the
resistance of an electric iron which when connected to the same
electric source permits the flow of the same electric current as by
the arrangement of the 2 appliances stated above
b) what is the current passing through the electric iron
c) calculate the power of electric iron

Govind · Accepted Answer

GivenResistance of electric lamp, R1=60 ΩResistance of toaster, R2=30 ΩAs they are connected in parallel, net resistance becomes1R=1R1+1R2⇒1R=160+130⇒1R=901800⇒R=20 ΩNow, current flowing through the circuit Iis given byI=VR=2020⇒I=1 AaAccording to the question, same current should flow through the iron
 Therefore itsReistance, R=VI⇒R=201=20 Ωb Current through the iron is 1 A
c Power of the iron, P=I2R⇒P=12×20=20 watt