Electronics practice problems
Worked problems to try on the page, each with the working step by step and a free lesson where you build the circuit for real.
- Ohm's law practice problemsFind V, I or R, then the power, with the working for each.10 problems
- Units and prefixes practice problemsConvert mA, kΩ, µF, nF, pF, ms and mV, with the working for each.10 problems
- LED resistor practice problemsSize the resistor for one LED or a string, round to a standard value, check the power.10 problems
- Electrical power practice problemsPower three ways, energy in kWh, battery life and running costs, all worked.10 problems
- Series and parallel resistors practice problemsTotals in series and parallel, mixed networks and branch currents, all worked.10 problems
- Kirchhoff's laws practice problemsBalance currents at a junction and voltages round a loop, with the working for each.10 problems
- Voltage divider practice problemsFind Vout, pick R2 for a target and work out loading, with the working for each.10 problems
- Capacitor practice problemsCharge, capacitance, series and parallel, and stored energy, with the working.10 problems
- RC time constant practice problemsτ = R × C, the 63% rule, charging and discharging, with the working.10 problems
- AC voltage and transformer practice problemsPeak, RMS, period, AC power and transformer turns ratios, with the working.10 problems
- Capacitive and inductive reactance practice problemsCapacitor and coil reactance, AC current and impedance, with the working.10 problems
- RC filter practice problemsCutoff frequency, choosing R or C, and the output either side of the cutoff, with the working.10 problems
- Decibel practice problemsRatios to dB and back, for power and voltage, gains that add and the −3 dB point.10 problems
- Zener diode practice problemsSize a Zener regulator's resistor, split its current and check the Zener's power.10 problems
- Transistor switch practice problemsBase current, base resistor and load current for a BJT switch, then a MOSFET.10 problems
- Op-amp gain practice problemsInverting and non-inverting gain, the output, the resistor to pick and when it clips.10 problems
- Binary and hex practice problemsBinary to decimal and back, bits needed, the largest n-bit number and hex.10 problems