 #1
tanaygupta2000
 204
 14
 Homework Statement:
 An electrical device operates on 9V and has a resistance of 21 ohm. It is connected to a power supply of 120 V output through a transformer. The current in the primary of the transformer is? (a) 0.032 A, (b) Cannot be determined from the information supplied, (c) 0.23 A, (d) 2.32 A
 Relevant Equations:

Primary power = Secondary power
VpIp = VsIs
Okay, so according to the transformer equation, VpIp = VsIs
In this question, I know I have to calculate Ip.
I think given, Vp = 9V, Vs = 120 V
Now I don't know what to use in the value of Is.
Please help!
The answer is 2.32 A.
In this question, I know I have to calculate Ip.
I think given, Vp = 9V, Vs = 120 V
Now I don't know what to use in the value of Is.
Please help!
The answer is 2.32 A.