Several fundamental formulas are used in electricity to calculate current, voltage, resistance, and power. These formulas are essential for understanding and solving electrical problems.
Key electrical formulas:
- Ohm’s Law:
- V = I × R
- Where V = voltage (volts), I = current (amperes), R = resistance (ohms)
- Current formula:
- I = Q / t
- Where I = current, Q = electric charge (coulombs), t = time (seconds)
- Voltage formula:
- V = W / Q
- Where V = voltage, W = work done (joules), Q = charge
- Power formula:
- P = V × I
- Also written as:
- Where P = power (watts)
- Electrical energy formula:
- E = P × t
- Where E = energy (joules or kWh), P = power, t = time
Units used:
- Current → Ampere (A)
- Voltage → Volt (V)
- Resistance → Ohm (Ω)
- Power → Watt (W)
In simple terms:
These formulas help calculate how electricity flows, how much energy is used, and how electrical devices operate.