![]() The CT we are using is rated at 100A, so it’s suitable for measuring the total power in a domestic home. ![]() The small current flowing in the burden resistor generates a voltage across it which can be measured and used to calculate the current flowing in the primary circuit. *For resistive loads – if you want to know the full story, see this article.Ĭurrent transformers (CT) are a specialised type of transformer where the primary coil is the Line cable in your building wiring, and the secondary coil is connected in series with a low-value resistor called a Burden resistor. So the Real Power, which is what your electricity company charges you for, is the product of RMS voltage and RMS current: ![]() The energy change for Alternating Current (AC) that is equivalent to Direct Current (DC) can be calculated by the Root Mean Square (RMS) of the current (Irms). Warning: Current Transformers are not directly connected to mains, but they do need to be clamped around an insulated, live mains power cable – Always switch off the power supply before doing so.įor resistive loads like kettles, ovens and immersion heaters, the instantaneous power can be calculated using Ohm’s Law and is the product of instantaneous voltage and current since both values are in phase, power is always positive.
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