Formula to Calculate Current

Ohm's Law Formula:

\[ I = \frac{V}{R} \]

Current (A):

1. What is Ohm's Law?

Definition: Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

Purpose: It helps electrical engineers, technicians, and students calculate current, voltage, or resistance in electrical circuits.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ I = \frac{V}{R} \]

Where:

\( I \) — Current (Amperes)
\( V \) — Voltage (Volts)
\( R \) — Resistance (Ohms)

Explanation: The voltage is divided by the resistance to calculate the current flowing through the circuit.

3. Importance of Current Calculation

Details: Proper current calculation ensures circuit safety, proper component selection, and efficient power usage in electrical systems.

4. Using the Calculator

Tips: Enter the voltage in volts and resistance in ohms. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What happens if resistance is zero?
A: In theory, current would be infinite (short circuit). In practice, this is impossible as all conductors have some resistance.

Q2: Does this work for AC and DC circuits?
A: The basic form works for DC circuits. For AC, impedance (Z) replaces resistance (R) in the formula.

Q3: What are typical household circuit currents?
A: Most household circuits in the US are 15-20A at 120V, with larger appliances using 240V circuits.

Q4: How do I measure voltage and resistance?
A: Use a multimeter to measure voltage across components and resistance of components (when power is off).

Q5: What's the relationship between current and power?
A: Power (P) = Voltage (V) × Current (I). Higher current means more power consumption for a given voltage.