What should be done before handling any capacitor?

Before handling any capacitor, it is essential to discharge it and then short the leads to ensure safety. Capacitors can store an electric charge even after being disconnected from a power source. If someone were to handle a charged capacitor, they risk receiving an electric shock, which could be dangerous, particularly for larger capacitors.

Discharging the capacitor safely reduces the risk of electric shock. Shorting the leads after discharging guarantees that any remaining charge is neutralized, preventing accidental recharging or discharge through unintended pathways. This procedure is a standard safety protocol in electrical work to minimize hazards related to stored electrical energy.

Options that involve connecting the capacitor to a voltage source or leaving it charged pose significant safety risks and therefore are not appropriate. Opening a capacitor to check its integrity isn't typically necessary for safe handling and could expose the person to additional risks, such as exposure to hazardous materials or components within the capacitor.