Rates of Change, SMB-003

The current of an electrical circuit, measured in amps (A), varies inversely with its resistance, measured in ohms (R).

When the resistance of a circuit is 28 ohms, the current is 3 amps.

What is the current when the resistance is 8 ohms? (2 marks)

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`10.5`

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`A`	`prop 1/R`
`A`	`= k/R`

`text(When)\ \ A=3, \ R=28`

`3`	`=k/28`
`k`	`=84`

`text(Find)\ \ A\ \ text(when)\ \ R=8:`

`A`	`=84/8`
	`=10.5`