Ampere (A) electrical unit

What is an ampere?

An Electrical unit ampere, or amp as it is more commonly referred to is the standard unit of current. The symbol for an ampere (A). It is determined as the amount of current that flows when a potential difference of 1 volt is applied across a resistance (R) of 1 ohm.

A Current is the measure of the amount of electrical charge moving through a specified point in a unit of time. It is referred to in mathematical formula by the symbol I. An ampere of current is flowing when a charge of one coulomb passes a point in a second.

Calculation to determine the Current in Amperes:

I = V/R

Ampere Meter

An ampere meter or ammeter is an electrical instrument that is used to measure electrical current flow in amperes.

When we want to measure the amperes and the electrical current on the load, the ampere meter is connected in a series of single lines to the load.

The resistance value of the ampere-meter is near zero, so it will not affect the measured circuit.

Ampere unit Prefixes of Information

Name Symbol Conversion Example
microampere (microamps) μA 1μA = 10-6A I = 50μA
milliampere (milliamps) μA 1μA = 10-3A I = 3mA
ampere (amps) A

-

I = 10A
kiloampere (kiloamps) KA 1KA = 103A I = 2KA

How to convert amps to microamps (μA)

The current flow (I) in microamperes (μA) is equal to the current I in amperes (A) divided by 1000000:

I(μA) = I(A) / 1000000

How to convert amps to milliamps (mA)

The current (I) in milliamperes (mA) is equal to the current flow (I) in amperes (A) divided by 1000:

I(mA) = I(A) / 1000

How to convert amps to kiloamps (kA)

The current (I) in kiloamperes (mA) is equal to the current (I) in amperes (A) times 1000:

I(kA) = I(A) × 1000

How to convert amps to watts (W)

The Real power P in watts (W) is equal to the current (I) in amps (A) times the voltage (V) in volts (V):

P(W) = I(A) × V(V)

How to convert amps to volts (V)

The voltage V in volts (V) is equal to the Real power (P) in watts (W) divided by the current (I) in amperes (A):

V(V) = P(W) / I(A)

The voltage (V) in volts (V) is equal to the current (I) in amperes (A) times the resistance (R) in ohms (Ω):

V(V) = I(A) × R(Ω)

How to convert amps to ohms (Ω)

The resistance (R) in ohms (Ω) is equal to the voltage (V) in volts (V) divided by the current (I) in amperes (A):

R(Ω) = V(V) / I(A)

How to convert amps to kilowatts (kW)

The Real power (P) in kilowatts (kW) is equal to the current (I) in amps (A) times the voltage (V) in volts (V) divided by 1000:

P(kW) = I(A) × V(V) / 1000

How to convert amps to kilovolt-ampere (kVA)

The apparent power (S) in kilovolt-amps (kVA) is equal to RMS current IRMS  in amps (A), times the RMS voltage VRMS in volts (V), divided by 1000:

S(kVA) = IRMS(A) × VRMS(V) / 1000

How to convert amps to coulombs (C)

The electric charge (Q) in coulombs (C) is equal to the current (I) in amps (A), times the time of current flow t in seconds (s):

Q(C) = I(A) × t(s)


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