Current is the same for resistors in series.

The sum of potential differences across 10Ω and 20Ω resistors should be equivalent to 15V

Potential difference is given by:

$\overline{){\mathbf{V}}{\mathbf{=}}{\mathbf{i}}{\mathbf{R}}}$

(a) What is the potential difference across the 10 Ω resistor in the figure ?

(b) What is the potential difference across the 20 Ω resistor in the figure?

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