Show that to get maximum power in an electrical circuit the external resistance should be equal to the internal resistance.

In the given circuit the current in each resistance is

How can an LCR circuit be made purely resistance?

A cell of emf 2.1 V and 0.1 Omega internal resistance sends 100 mA current in an external circuit. Determine the external resistance,terminal potential difference across that resistance and internal potential drop of the cell.

What is the power factor of a circuit having a pure resistance only?

you have several identical electric cells. IF the internal resistance of the cells be (i) very much greater (ii) very much smaller than external resistance, then how should the cells be connected with that resistance to increase the current through it?

The internal resistance of a cell of emf E is r, and external resistance is R. What is the potential about the external Resistance

5 electric cells are connected in series .Emf of each cell is 1.5 V and internal resistance is 0.1 Omega .When this combination of cells is connected with an external circuit of resistance 4 Omega, what will be the current through that resistance? What resistance should be connected instead of 4 Omega so that the current will be halved?

Two cells one of emf 1.4 V and internal resistance 0.6 Omega the other of emf 2.5. V and internal resistance 0.3 Omega are connected in parallel and the combination is connected in series with an external resistance of 4 Omega . What is the current through this resistance?

A galvanometer of resistance R is connected to an electric circuit. The main current in the circuit is k times the maximum current that the galvanometer can withstand. The maximum value of the stunt resistance that should be used across the galvanometer is