Resistors can be arranged in series and in parallel.
![resistor-series-parallel](https://i0.wp.com/fixpiecdn.files.wordpress.com/2020/05/resistor-series-parallel.jpg?ssl=1)
have different potential differences.
When they are connected in parallel, they have the same potential difference but different current.
Ohm’s Law
The electric current passing through a metallic conductor is directly proportional to the potential difference applied between its end provided temperature and other physical property of the conductor remains constant.
Current =Potential differenceResistanceV=IR
R is a constant of proportionality and depends on the nature of the material. The unit of resistance is ohm.
Calculations
- A potential difference of 240V is applied to a lamp of 60 ohms resistance. What amount of current will flow in the circuit?
Solution
Current =Potential differenceResistance=24060=4A
- (a) Calculate the effective resistance in the diagram shown below.
(b) Calculate the current flowing in the circuit aboveSolution(a) Solve the parallel first,1RP=1R1+1R21RP=12+121RP=22=1RP=1ΩR=RP+4=1+4=5Ω(b) Total resistance = 5Ω.From Ohm’s law,Current =Potential differenceResistance=205=4A
- A current of 3A flows in a circuit when a p.d of 24V is applied to it. The resistance across the circuit is
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