Electric Power Calculator

P=VI, energy consumption and electricity cost

Quick Answer

Electric Power Calculator: P=VI, energy consumption and electricity cost. Electric Power Calculator uses standard science & engineering formulas to compute accurate results instantly.

Appliances:

Power (W)

Hours/day

Days

Price (CNY/kWh)

Total cost over 30 days

¥145.20

264.0 kWh consumed

Per day8.80 度

Current @220V5.0 A

Monthly est.¥145.20

Yearly est.¥1766.60

Steps

1Energy/day = 1.10 kW × 8 h = 8.80 kWh (1 kWh = 1000W × 1h)
2Current I = P/U = 1100 ÷ 220 = 5.0 A
330 days: 264.0 kWh × ¥0.55 = ¥145.20

Appliance power reference

Appliance	Power	kWh/day	Cost/mo
AC 1.5HP ←	1.10 kW	8.80	¥145.2
Water heater	2.00 kW	4.00	¥66.0
Space heater	1.50 kW	9.00	¥148.5
Refrigerator	150.0 W	3.60	¥59.4
Washer	500.0 W	0.50	¥8.3
Desktop PC	300.0 W	2.40	¥39.6
LED bulb	10.0 W	0.06	¥1.0
Kettle	1.80 kW	0.54	¥8.9

💡 Heating appliances (AC, heater, kettle) dominate electricity bills — every +1°C on AC saves ~6-8% energy. Check standby drain too: chargers and set-top boxes idle at 1-5W each, adding up to 10-30 kWh/year.

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How to Use

Enter known quantities: fill values and confirm units in the Electric Power Calculator.
Instant solution: unknowns solve live with the formula shown transparently.
Use constant/material tables: standard physical constants and material data are listed on this page.
Compare conditions: change inputs to compare scenarios.

Key Points

Electric Power Calculator is a free online science & engineering tool — open and use, no sign-up.
All calculations run locally in your browser; your data never leaves the device.
Key capability: P=VI, energy consumption and electricity cost.
Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Electric Power Calculator formula

Electric Power Calculator uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Electric Power Calculator?

Open the page and fill in the input fields — results update automatically. P=VI, energy consumption and electricity cost.

Are the results accurate?

Yes. Standard formulas and conversion factors are used and verified.

Is it free? Do I need to sign up?

Completely free. No registration, login or download required.

Does it work on mobile?

Yes. The responsive design works on phones, tablets and desktops.

Is my data saved?

No. Everything runs locally in your browser.

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Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated: 2026-08-04

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Cite this page: YiJianSuan. Electric Power Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/electric-power

Results provided by this tool are for reference only and do not constitute professional advice.