Ohms law problems

This topic is the solving problems of ohm’s law. Before solving problems everyone should learn ohm’s law. For learning ohm’s law click here. Mathematical application of ohm’s law is very simple. Some ohms law problem and solutions are given below.Ohms law calculations
1. If 0.6A current flows through a resistor shown in figure. Voltage of two points of resistor is 12V. What is the resistance of the resistor?

Solution:

Here, Current, I = 0.6A
Potential difference or Voltage, V = 12V
Resistance, R =?
According to ohms law questions we know,
V = IR
Or, R =V / I
=12V / 0.6A
=20 Ω

Ans: 20 Ω.

2. Resistance of an electric iron 50 Ω.4.2A Current flows through the resistance. Find the voltage between two points.
Solution:
Here, Resistance, R = 50 Ω.
Current, I =4.2 A
Voltage, V =?
From Ohm’s law,
V = IR
= 4.2 × 50
= 210V
Ans: 210V.
Another problem for practice
• Filament resistance of an electric bulb is 660 Ω. Potential difference of two points 220V. Find the current through the filament flowing.
Ans: 0.33 A.