The ratio of the resistance of 10.om of aluminium wire 2.2mm in diameter to 24.0m of a copper wire 1.8 mm in diameter is 0.45.
A force, such as friction, that operates opposite the direction of motion of a body and tends to prevent or slow down the body's motion. A measure of the degree to which a substance impedes the flow of electric current induced by a voltage. Resistance is measured in ohms.
"Resistance" may sound negative, but in electricity it can be used beneficially. Examples: Current must struggle to flow through the small coils of a toaster, enough to generate heat that browns bread. Old-style incandescent light bulbs force current to flow through filaments so thin that light is generated.
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