NCV is a multimeter feature that detects AC voltage without physical contact. Modern multimeters include NCV for safe voltage identification. NCV helps identify live wires and circuits without hazards
MOSFETs are efficient but complex devices for amplifying and switching loads. Testing MOSFETs can be challenging even for beginners
Digital multimeter with diode setting needed for LED testing. Mid-range multimeter costs $50-100 USD. Connect red lead to positive, black lead to negative. Turn dial clockwise to diode setting. Black probe should touch LED cathode, red probe anode
Multimeter measures AC/DC voltages, resistance, and current in circuits. Instrument has arc-shaped scales and pointer for readings. Modern meters offer digital displays with automatic ranging
Resistance measures difficulty electrons flow through objects. Resistance is measured in ohms (1 ohm = 1 volt/1 amp). Components can range from ohms to megaohms
Capacitors store voltage in electronic circuits. Electrolytic capacitors fail from current discharge or electrolyte depletion. Non-electrolytic capacitors typically fail from charge leakage. Capacitance is measured in farads (F) or microfarads (µ)