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Transistor

The DC power ...

Question

The $D C$ power source for arc welding has the characteristic $3 V + I = 240$ . where $V =$ Voltage and $I =$ Current in an amp. For maximum arc power at the electrode, voltage should be set at

40 V

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80 V

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20 V

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60 V

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Solution

The correct option is A $40 V$
$Given data:$

$3 V + I = 240 \Rightarrow I = 240 - 3 V$

$Power (P) = V I = V (240 - 3 V)$

$For max arc power$

$\frac{d P}{d V} = 240 - 6 V = 0$

$V = 40 V$

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