Ampere Calculator
Calculate the electric current in amperes (A) by entering the power in watts (W) and the voltage in volts (V).
Ampere Calculation Parameters
Ampere Calculation Formula
The current (in amperes) is calculated by dividing the power (in watts) by the voltage (in volts).
Common Appliance Amperage (at 120V)
| Appliance | Amperage (A) |
|---|---|
| LED Light Bulb | 0.08 - 0.12 A |
| Laptop | 0.2 - 0.8 A |
| Desktop Computer | 0.8 - 4 A |
| Refrigerator | 1 - 6 A |
| Microwave | 5 - 10 A |
Frequently Asked Questions
What is an ampere?
An ampere (or amp) is the base unit of electric current in the International System of Units (SI). It is named after André-Marie Ampère, a French mathematician and physicist, considered the father of electromagnetism.
Is it safe to use a device with a higher amperage rating than the power source?
No. The amperage rating of a power source indicates the maximum current it can safely supply. A device that draws more current than the source can provide will cause the source to overheat, potentially leading to a fire.
What is the difference between amps, volts, and watts?
Amps measure the rate of electrical current flow. Volts measure the electrical potential difference. Watts measure the rate of energy transfer (power). They are related by the formula: Watts = Volts × Amps.