Find the Thevenin and Norton equivalents of the circuit shown below. Consider R1 = 12 Ω, R2= 24 Ω, R3= 7 Ω, V = 18 V and I= 2,25 A Draw also the Thevenin and Norton equivalent circuits.

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell