Current Formula
The current formula is derived from the Ohms law. Current is defined as the flow of electrons in an electric circuit. The flow of electrons occurs due to potential differences. The current is also known as the rate of change of charge with time. Current is represented by I and SI unit of current is Ampere. Let us learn the application of the current formula in the section below.
What Is the Current Formula?
According to Ohm's law, the current is the ratio of the potential difference and the resistance. Thus, the current formula is given by: I = V/R
where
- I represent current in Ampere,
- V is the potential difference in Volt
- R is the resistance in Ohm(Ω).
Let us see the applications of the current formula in the following solved examples section.
Examples Using Current Formula
Example 1: In an electric circuit, the potential difference and the resistance are given as 20V and 4Ω respectively. Using the current formula, find the current flowing in the circuit.
Solution:
To find: Current(I) flowing in the circuit.
Given:
V = 20V, R = 4Ω
Using Current formula
I = V/R
I = 20/4
I = 5
Answer: Current flowing in the circuit is 5 Ampere.
Example 2: The total current flowing in an electric circuit is 50Amp whereas the resistance of the wires is 14Ohm. Using the current formula find the potential difference.
Solution:
To find the potential difference:
Given:
I = 50 A, R = 14Ω
Using Current formula
I = V/R
50 = V/14
V = 50 × 14
V = 700
Answer: Potential difference is 700 V.
Example 3: In an electric circuit, the potential difference is 20 V and the value of current is 5 Amp respectively. Using the current formula, find the resistance of the circuit.
Solution:
To find the resistance(R) of the circuit:
Given:
V = 20V, I = 5 Amp
Using Current formula
R = V/I
R = 20/5
R = 4Ω
Answer: The resistance of the circuit 4Ω.
FAQs on Current Formula
How Do You Calculate Current Using Current Formula?
If the voltage (V) and resistance (R) of any circuit is given we can use the current formula to calculate the current, i.e., I = V/R (amps).
How Do You Calculate Voltage Using Current Formula?
If the current (I) and resistance (R) of any circuit is given we can mold the current formula to calculate the voltage, i.e., V = IR (Volts).
How Do You Calculate Resistance Using Current Formula?
If the current (I) and potential difference (V) of any circuit are given we can mold the current formula to calculate the resistance, i.e., R = V/I (Ohms Ω).
What Is the Definition of Current Formula? Write Its SI Unit.
The current is the ratio of the potential difference and the resistance. It is represented as (I). The current formula is given as I = V/R. The SI unit of current is Ampere (Amp).