Direction: Read the following problems carefully and solve them by using the
formula of Ohm’s law. Do not forget your unit. Good luck!
1. What is the potential difference across an electrical load that has a resistance
of 4 Ω and a current of 3 A flowing through it?
2. Calculate the current and electric clothes dryer draws when it is connected to a
230 V source and has a resistance of 9.2 Ω.
3. An electric toaster has a resistance of 12 Ω. What current will it draw from a 120
V supply?
4. A portable radio connected to a 9.0 V battery draws a current of 25 A. What is
the resistance of the radio?
5. What is the resistance in a circuit if a potential difference of 110 V causes a
current of 10 A?
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Verified answer
Answer:
1. 12 V
2. 25 A
3. 10 A
4. 0.36
5. 11
Explanation:
1. V=IR
= (3)(4)
V= 12
2. I= V/R
= 230/9.2
I = 25
3. I= V/R
= 120/12
I=10
4. R= V/I
=9.0/25
R=0.36
5. R=V/I
=110/10
= 11