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Download Portable Appliance Testing Course Pre-Study Revision
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Perquisite knowledge before Training and Assessment Portable Appliance Testing Course Pre-Study Revision The candidate will need to understand basic electrical symbols and measurement units. i.e.… voltage (V) measured in volts (V), current (I) measured in Amperes (or amps for short) (A), resistance (R) measured in ohm’s (), power (P) measured in watts (W) The candidate will need to understand basic numeric prefixes used with electrical symbols and measurement units i.e.… milli (m) a thousandth e.g. 3mA : three thousandths of an amp kilo (k) a thousand times e.g. 100k : one hundred thousand ohms mega (M) a million times e.g. 2M : two million ohms Basic relationship between current, voltage, resistance and power The candidate will need to understand the principles of Ohm’s Law:V=IxR I=VR R=VI i.e… In a circuit with a voltage of 230V and a resistance of 46 what current would flow? Therefore:then and I=VR I = 230 46 I = 5A The candidate will need to understand the relationship between electrical power, applied voltage and circuit load current: P=IxV In the above example, for a load current of 5A at an applied voltage of 230V, calculate the power used If :- P=IxV then P = 5A x 230V so P = 1150W or 1.15kW Copyright all rights reserved with NAPIT @ December 2004 234836323