Question

Find the current that flows through the filament of a 400 watts flat iron connected to a 220 Volt power line

( 50 mA, 5 A, 5mA, 500 mA )

Answer 1

Use:
\[P=\frac{ V^2 }{ R }\]
To find the resistance and then use
\[V = IR\]
to find the current

Answer 2

already try that formula but it didnt help to find the correct answer... oh yeah forgot to insert the choices... ( 50 mA, 5 A, 5mA, 500 mA )

Answer 3

have type the Q completely??

Answer 4

thats all the question... what really bothers me if there's a constant that you have to use in it...

Answer 5

The answer I am getting is : \(I = 1.81 \; Amp\)

Answer 6

Using net, I have downloaded this Document, check \(Ques : 34\) of the Document :

Answer 7

we use P=VI
400=220*i
i=400/220=1.8 amp

Answer 8

so this is the max current can flow through the device

Answer 9

500ma=0.5 amp is most suited ans to this

Answer 10

@entrial its correct u can try buddy i m sure :)

Answer 11

some of the voltage drop will be in the iron but, not at the filament

Answer 12

@gorv yes 0.5 A or 500mA is the correct answer just want to know how did he get that answer and @waterineyes were also getting the same output...

Answer 13

yeah bcozz it is the nearest value

Answer 14

we can consider that some current will flow in other part

Answer 15

more than 1.8 A will not flow so nearest to 1.8 is 0.5

Answer 16

ok @gorv your the BAT thanks....

Answer 17

welcme buddy :)