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If you are referring to the voltage at your residence, then voltage variation is caused by the changes to the load on your supply network. The network load varies throughout the day, being busiest, for example, around lunchtime and around dinnertime. The resulting load current variation causes the supply voltage to vary (it drops when the load current increases) but, by law, your supplier is obliged to maintain any voltage variation within limits -in the UK, for example, these limits are between +10% and -6% of the nominal 230 V.
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Does transformer doubles the power?
No. Power is constant. Transformers neither increase nor decrease power, except for minor losses. They increase or decrease voltage, and they decrease or increase current, but the product of voltage and current, i.e. power, remains the same.
When a battery runs out does the battery voltage increase decrease or stay the same?
It should decrease
What is the effect of low frequency on the voltage?
The frequency would decrease the gain and increase the output voltage
Why does the terminal voltage increase in leading load?
due to decrease in power factor
Can you list three ways you can change the current in a circuit?
Increase, decrease, or remove the load <<>> Change the voltage and the current will also change in direct proportion, Ohms law.
