Resistance

Resistance opposes current flow. It is like electrical "friction." This resistance slows the flow of current. Every electrical component or circuit has resistance. And, this resistance changes electrical energy into another form of energy -heat, light, motion.

Resistance is measured in ohms. A special meter, called an ohmmeter, can measure the resistance of a device in ohms when no current is flowing.

Resistance

Basic Unit

Units for Very Small Amounts

Units for Very Large Amounts

Symbol

n

yufi

mfi

k fi

Mfi

Pronounced As

Ohm

Microohm

Milli-ohm

Kiloohm

Megaohm

Multiplier

1

0.000001

0.001

1,000

1,000,000

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