In practical terms, the ampere is a measure of the amount of electric charge passing a point in an electric circuit per unit time with 6.241 × 10 to 18th power of electrons, or one coulomb per second constituting one ampere.

Portable gadgets

Hearing aid (typically 1 mW at 1.4 V): 0.7 mA

Motor vehicles – 12 V DC

A typical motor vehicle has a 12 V battery. The various accessories that are powered by the battery might include:

Instrument panel light (typically 2 W): 166 mA.
Headlights (typically 60 W): 5 A each.
Starter Motor (typically 1–2 kW): 80-160 A

North American domestic supply – 120 V AC

Most United States, Canada and Mexico domestic power suppliers run at 120 V.

Household circuit breakers typically provide a maximum of 15 A or 20 A of current to a given set of outlets.

22-inch/56-centimeter portable television (35 W): 290 mA
Tungsten light bulb (60–100 W): 500–830 mA
Toaster, kettle (2 kW): 16.6 A
Immersion heater (4.6 kW): 38.3 A

European domestic supply – 230 V AC

Most European domestic power supplies run at 230 V,

The current drawn by a number of typical appliances are:

22-inch/56-centimeter Portable Television (35 W): 150 mA
Tungsten light bulb (60–100 W): 250–450 mA
Toaster, kettle (2 kW): 9 A
Immersion heater (4.6 kW): 20 A

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