Answer to Question #171713 in Electric Circuits for Paul

Question

A parallel connection of two resistor 5ohms and 10ohms with current 5A each from the same end point of a circuit(the connection is like a triangle),is connected in series with another resistor of 20ohms.Calculate the potential difference across 20ohms

Answer 1

Explanations & Calculations

• Since each parallel resistor conducts current & they are connected to another resistor in series, all the current from each branch go through the resistor in series.
• Therefore, current through the $\small 20\Omega$ resistor is ($\small i=5A+5A=$) 10A.
• Then according to the equation $\small V=iR$, the potential difference across the $\small 20\Omega$ is

$\qquad\qquad \begin{aligned} \small V&=\small 10A\times 20\Omega\\ &=\small \bold{200V} \end{aligned}$