Electric Power

Circuit Visualization

Real-time Calculations

Voltage (V) 230 V

Current (I) 2.30 A

Resistance (R) 100 Ω

                                Power (P)
                                529 W
                            

Control Panel

Voltage (V): 230 V

Current (I): 2.30 A

Resistance (R): 100 Ω

Calculation Mode

Device Presets

Power Formulas

P = V × I

Universal formula - multiply voltage by current

P = 230 × 2.30 = 529W

Best for: Direct measurements

P = I²R

Series circuits - current through each component

P = 2.30² × 100 = 529W

Best for: Series circuits, heating

P = V²/R

Parallel circuits - voltage across each component

P = 230²/100 = 529W

Best for: Parallel circuits, power lines

Energy & Cost Calculator

Usage Time: 1 h

Electricity Price: 0.5 ¥/kWh

Energy Consumed 0.529 kWh

Energy in Joules 1.90 MJ

                            Estimated Cost
                            ¥0.26
                        

Joule Heating Visualization

Temperature 25°C

Joule's Law: Q = I²Rt

Heat generated is proportional to current squared, resistance, and time

I² = 5.29 A²

R = 100 Ω

Power = I²R = 529 W

Heat/second = 529 J/s

Understanding Electric Power

What is Electric Power?

Electric power is the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt (W), equal to one joule per second.

Formula Relationships

Using Ohm's Law (V = IR), we can derive three equivalent power formulas: P = VI, P = I²R, and P = V²/R. Choose the one that matches your known values.

Energy vs Power

Power is the rate of energy transfer (watts), while energy is the total amount transferred (joules or kilowatt-hours). Energy = Power × Time.

Joule Heating

When current flows through a resistor, electrical energy converts to heat. This principle powers electric heaters, incandescent bulbs, and causes energy loss in power lines.