Find the resistance of a portable lantern that uses a 20V power supply and draws a current of 0.5A.

well, the required resistance will be = 40 ohms

Explanation:

let the resistance be R

according to OHM's law :

potential difference ( v ) =

resistance ( R ) × current ( I )

so, 20v = 0.5 A × R

=》20v / 0.5 A = R

=》R = 40 ohms

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