Question 1

When power and current are known use R = P/I^2 to calculate the resistance.

P = 300 watts
C = 30amps
R = ?
R = resistance, P = Power, 1 = Current

Question 2

$\bf{ \underline{Given:- }}$

$\sf• \: Power \:( P) = 300 \: watts$

$\sf• \: Current \: (I) = 30 \: amps$

$\\$

$\bf{ \underline{To \:  Find:- }}$

$\sf• \: The \: Resistance$

$\\$

$\huge\bf{ \underline{Solution :-:- }}$

$\bf \red {\bigstar{ Formula \: of \: Power \: (P) = \frac{ {I}^(2) }{R}}}$

$\sf \rightarrow 300= \frac{ {30}^(2) }{ R}$

$\sf \rightarrow 300 = (900)/( R)$

$\rightarrow \sf R = (300)/(900)$

$\rightarrow \sf R = (1)/(3)$

$\rightarrow \sf R = 0.33$

$\bf \purple{Hence, \: the \: resistance \: is \: 0.33 \: Ω \: . }$