Circuits — Set 3

A kilowatt-hour (kWh) is a unit of what physical quantity?

Why is the metal body of an appliance connected to the earth wire?

What is the main function of a diode in an electric circuit?

In a series circuit containing several resistors, what is true about the current?

In a parallel circuit, what is true about the potential difference across each branch?

For a cell of emf E and internal resistance r delivering current I, what is the terminal voltage V?

For maximum power transfer from a cell to an external resistor, what should be the relation between load resistance R and internal resistance r?

A meter bridge used to find an unknown resistance mainly works on which principle?

Two equal resistors each of resistance R are connected in parallel. What is the equivalent resistance?

For an ideal ammeter, what is the potential difference across it during measurement?