Question

Design a buffer circuit that can be utilized to drive two motors, each of 200 W. Note that there is a single source of 20V (highest current can be drawn 5 Amp).

Answer 1

Given that,

Power P= 200 W

Voltage = 20 V

We need to calculate the resistance

Using formula of power

$P=\dfrac{V^2}{R}$

Where, V = voltage

R = resistance

Put the value into the formula

$200=\dfrac{20^2}{R}$

$R=\dfrac{20^2}{200}$

$R=2\ \Omh$

We need to calculate the current

Using formula of power

$P=I^2R$

Where, P = power

I = current

R = resistance

Put the value into the formula

$200=I^2\times2$

$I^2=\dfrac{200}{2}$

$I=\sqrt{100}$

$I=10\ A$

Hence, The current is 10 A