The efficiency of a fuel cell is given by

What is an electrode and a half-cell? Explain their symbolic representation with a suitable example.

In a fuel cell,$H_2$ and $O_2$ react to produce electricity. In this process,$H_2$ gas is oxidized at the anode and $O_2$ gas is reduced at the cathode. If $67.2 \ L$ of $H_2$ gas at $\text{STP}$ is consumed in $15 \ min$,what is the current produced (in $A$)?

In the electrochemical cell $H_{2(g)}, 1 \ atm \ | \ H^+_{(aq)}, 1 \ M \ || \ Cu^{2+}_{(aq)}, 1 \ M \ | \ Cu_{(s)}$,which of the following statements is true?

$A$ saturated solution of $KNO_3$ is used to make a salt bridge because...

What happens to the voltage if the salt bridge is suddenly removed from a working electrochemical cell?