Question

Determine the resistance of a coil connected to a 150 V supply when a current of
(a) 75 mA (b) 300 uA flows through it. Determine the power dissipated through it.​

Answer 1

Answer:

Please refer to the pictures.

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Answer 2

Answer:

The resistance and power dissipated in each case are

$(a)R=2000\Omega,P=11.25W\\(b)R=5\times10^{5}\Omega,P=0.045W$

Explanation:

Given that,

The voltage of coil is $V=150V$

The relation between the voltage supplied,resistance(R) and current(i) is mentioned below

$V=iR$

The relation between power dissipated,voltage and current is $P=Vi$

Using these relations we shall find the resistance and power dissipated.

(a)i=75mA

The resistance is calculated as follows

$150=75\times10^{-3}R= > R=2000\Omega$

The power dissipated is

$P=150\times75\times10^{-3}=11.25W$

(b)i=300uA

The resistance is calculated as follows

$150=300\times10^{-6}R= > R=5\times10^{5}\Omega$

The power dissipated is

$P=150\times300\times10^{-6}=0.045W$

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