Electric Power Calculator
Electric Power Calculator
| Quantity | Value |
|---|---|
| Voltage | 120.0 V |
| Current | 10.0 A |
| Power (P = V × I) | 1,200 W |
| Power (kW) | 1.20 kW |
| Resistance (R = V ÷ I) | 12.00 Ω |
| Energy for 2.0 h | 2.40 kWh |
| Electricity Cost | $0.36 @ $0.15/kWh |
Energy Accumulation Over Time
Cumulative energy at 1.20 kW
About the Electric Power Calculator
Power is the product of voltage and current: P = V × I. At 120 V and 10 A, a space heater draws 1,200 W. Over 2 hours it consumes 2.4 kWh, and at $0.15/kWh that is $0.36 — the calculation behind every appliance energy label.
Power, Energy, and Cost
Power (watts) is instantaneous; energy (kWh) is power integrated over time; cost is energy times the rate. Appliances list power because it determines both current draw (circuit sizing) and cost (via usage time). The derived resistance R = V/I is useful for load checks and fuse selection.
Frequently Asked Questions
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