Power
Understand the electricity behind your smart home: what a kilowatt-hour actually costs, where standby power quietly leaks money, and how to read a tariff. Practical guides for cutting an Australian power bill.
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Everything power
Every Synced guide to home electricity: what your power actually costs, where it quietly leaks, and how to cut the bill.
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Downlight calculator
Work out how many downlights a room needs and how far apart to space them, using room size, ceiling height and the lumen output of the fitting you have chosen.
Voltage drop calculator
Work out voltage drop on any cable run using the AS/NZS 3008 method, and check it against the 5% limit in the Wiring Rules. Australian figures, 230 V nominal.
Lumens to watts calculator
There is no fixed lumens to watts conversion, it depends on the lamp. Estimate the watts behind any brightness for LED, halogen, CFL or incandescent, plus efficacy figures and old bulb equivalents.
Ohm's law calculator
Ohm's law links voltage, current and resistance as V = I × R. Enter any two values in the calculator to find the third, plus the power in watts, with the formulas and worked examples.
Watts, amps & volts: conversions explained
How to convert watts to amps (and back) on 230 V Australian mains, 12 V DC and three-phase, with a live calculator, worked examples and a reference table.