Ohm law
DC Ohm’s law for an ohmic resistor; resistance is treated as constant.
Electricity and electronics ↗Electricity and electronics calculators
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Calculators
DC electrical power
DC power is voltage times current.
Electricity and electronics ↗Series resistance
Series resistances add directly.
Electricity and electronics ↗Parallel resistance
Adds conductances, then takes the reciprocal.
Electricity and electronics ↗Voltage divider
The output is across the lower resistor.
Electricity and electronics ↗Current divider
Current divides in proportion to branch conductance.
Electricity and electronics ↗LED series resistor
An ideal resistor calculation; choose real component ratings and tolerances separately.
Electricity and electronics ↗Resistor colour code
Supports a four-band resistance code: two digits, multiplier and tolerance.
Electricity and electronics ↗Resistor tolerance range
The tolerance band is symmetric around the nominal value.
Electricity and electronics ↗Capacitors in series
Ideal capacitors in series add reciprocal capacitances.
Electricity and electronics ↗Capacitors in parallel
Ideal parallel capacitances add directly.
Electricity and electronics ↗Capacitor stored energy
Converts microfarads to farads before applying E = ½CV².
Electricity and electronics ↗RC time constant
Ideal first-order RC circuit.
Electricity and electronics ↗RL time constant
Ideal first-order RL circuit; the time constant is L/R.
Electricity and electronics ↗LC resonance
Ideal LC resonance ignores resistance and parasitic effects.
Electricity and electronics ↗Reactance
Reactance magnitudes for ideal components at a single sinusoidal frequency.
Electricity and electronics ↗Series RLC impedance
Ideal series RLC circuit.
Electricity and electronics ↗AC power factor
This magnitude relation assumes the appropriate sinusoidal model; it does not determine leading versus lagging power factor.
Electricity and electronics ↗Three-phase balanced power
Balanced three-phase sinusoidal system with line-to-line voltage.
Electricity and electronics ↗Ideal transformer ratio
Ideal transformer with no losses or regulation effects.
Electricity and electronics ↗Wire resistance
Use resistivity at the actual operating temperature.
Electricity and electronics ↗DC cable voltage drop
Loop resistance includes both outbound and return conductors.
Electricity and electronics ↗Decibel power ratio
For power use 10 log10 of the ratio.
Electricity and electronics ↗Battery charge quantity
Assumes constant current throughout the interval.
Electricity and electronics ↗PWM average voltage
Rectangular waveform switching between zero and the stated supply; ideal switching is assumed.
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