What is Ohm’s Law?
Ohm’s Law is a fundamental principle in electricity that describes the relationship between voltage, current, and resistance in an electrical circuit.
1. Definition
Ohm’s Law states that:
The current (I) flowing through a conductor is directly proportional to the voltage (V) across it and inversely proportional to its resistance (R).
Mathematically:I=RV
Where:
- I = Current in amperes (A)
- V = Voltage in volts (V)
- R = Resistance in ohms (Ω)
2. Key Points
- If the voltage increases, current increases (if resistance stays constant).
- If the resistance increases, current decreases (if voltage stays constant).
- Conductors obeying Ohm’s Law are called ohmic conductors.
3. Examples
- A simple electric circuit with a battery and a resistor.
- Household wiring where voltage and resistance determine current flow.
4. Applications
- Designing electrical circuits.
- Calculating current in resistors, wires, and electronic devices.
- Ensuring safe operation of electrical equipment.
Summary Table:
| Feature | Description |
|---|---|
| Law Name | Ohm’s Law |
| Formula | I=RV |
| Relationship | Current ∝ Voltage, Current ∝ 1/Resistance |
| Unit of Current | Ampere (A) |
| Unit of Voltage | Volt (V) |
| Unit of Resistance | Ohm (Ω) |
| Practical Use | Circuit design, electrical calculations |
Key Point:
Ohm’s Law is the foundation of understanding electrical circuits, linking voltage, current, and resistance in a simple relationship.