Question

An electric iron when works in 220 volt line has a resistance of 31.25 Om what is the current in SI unit??

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Answer 1

Answer:

The electric power required to operate a device in the input voltage times current

Required

P=VI

Where

P= Electric power

V=voltage used

I= current in amperes

VI is V times I

Electric power is measured in watts the electric energy used is the electrical power times the time as hours we get the energy used by an electrical system in term of kilowatt-hours that us the unit of measures the electric company uses when determining

Our bill

In this case the electronic iron resistance 88 is used 220 volts for 2hours

The power P = VI substituting I=V/R we get P=

R

V

2

=88

220

2

=550W=0.55kW

Therefore energy spent = E=pt=

0.55kW×2hrs=1.1 units