Voltage

Voltage is electrical pressure, a potential force or difference in electrical charge between two points. It can push electrical current through a wire, but not through its insulation.

Voltage is measured in volts. One volt can push a certain amount of current, two volts twice as much, and so on. A voltmeter measures the difference in electrical pressure between two points in volts. A voltmeter is used in parallel.

Basic

Units for Very

Units for Very

Voltage

Unit

Small Amounts

Large Amounts

Symbol

V

MV

mV

kV

MV

Pronounced

Volt

Micro

Milli

Kilo-

Mega-

As

volt

volt

volt

volt

Multiplier

1

0.000001

0.001

1,000

1,000,000

VOLTMETER VOLTS

VOLTAGE IS PRESSURE

VOLTMETER VOLTS

CURRENT

Current is electrical flow moving through a wire. Current flows in a wire pushed by voltage.

Current is measured in amperes, or amps, for short. An ammeter measures current flow in amps. It is inserted into the path of current flow, or in series, in a circuit.

Basic

Units for Very

Units for Very

Current

Unit

Small Amounts

Large Amounts

Symbol

A

mA

mA

kA

MA

Pronounced

Ampere

Micro

Milli

Kilo-

Mega-

As

(Amp)

ampere

ampere

ampere

ampere

Multiplier

1

0.000001

0.001

1,000

VOLTAGE CURRENT

AMMETER

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