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Мощность Калькулятор | Electrical Мощность Калькулятор

Рассчитать electrical power (ватты)

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Мощность Формулы

BasicP = V × I

With RP = I²R = V²/R

Units

1 kW = 1000 W
1 MW = 1,000,000 W
1 HP ≈ 746 W
1 kWh = 1 kW for 1 hour

Связанные

Understanding Electrical Мощность

Electrical power is the rate at which electrical energy is transferred or consumed. It's measured in ватты (W), named after James Watt. Мощность tells you how fast energy is being used.

Мощность Формулы

P = V × I - Мощность equals напряжение times current (Watt's Law)

P = I²R - Мощность equals current squared times resistance

P = V²/R - Мощность equals напряжение squared divided by resistance

Мощность против Энергия

Мощность (ватты) is the rate of energy use. Энергия (ватт-часы) is power multiplied by time. Your electricity bill charges for energy (kWh), not power. A 100W bulb running for 10 hours uses 1 kWh.

AC Мощность

In AC circuits with reactive loads, real power P = V × I × cos(θ) where cos(θ) is the power factor. Apparent power S = V × I is measured in VA. Real power is what does useful work.

Часто задаваемые вопросы

The basic power formula is P = V × I (ватты = вольты × амперы). Combined with Ohm's Law, you also get P = I²R and P = V²/R. These let you calculate power knowing any two of: напряжение, current, or resistance.

Simply multiply: Ватты = Вольты × Амперы. Пример: A 120V outlet supplying 10 амперы provides 120 × 10 = 1200 ватты of power. This works for DC and resistive AC loads.

Мощность is the rate of energy use (ватты). Энергия is power × time (ватт-часы or джоули). Think of power as speed and energy as distance. A 1000W appliance running 1 hour uses 1000Wh = 1kWh of energy.

Мощность factor (PF) is the ratio of real power to apparent power, ranging from 0 to 1. Real power P = V × I × PF. Resistive loads (heaters, bulbs) have PF ≈ 1. Motors/inductors have PF ≈ 0.8-0.95.

1 mechanical horsepower = 746 ватты. 1 metric horsepower = 735.5 ватты. To convert HP to ватты, multiply by 746. A 5 HP motor uses about 3730 ватты at full load (assuming 100% efficiency).

P = I²R shows power loss is proportional to current squared. Doubling current quadruples power loss. This is why high-напряжение transmission lines are used - same power with lower current means dramatically less loss.