(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

240V,50 Hz electrical appliance is rated at 2KW and has a lagging power factor of0.7.

a)Determine the appliance's power factor when it is used on a 60Hz supply?

b)Calculate the supply voltage required to maintain the appliance at its rated power when operated off a 60Hz supply?

2. Relevant equations

p.f.=P/S

S^2=P^2+Q^2 to obtain Q

S=VsI to obtain I

Z=Vs/I to obtain Z

p.f. = R/Z to obtain R

Z^2=R^2+Xl^2 to obtain Xl

Xl=2pifL to obtain L at 50Hz

3. The attempt at a solution

I have done the above then used the value for L in Xl=2pifL at 60 Hz but not sure were to go from here.

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# Power factor and frequency change

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