Inside a electrical starter there is basically two things are present one is capacitor another is a bi-metallic strep. This bi-metallic strip is normally in closed condition but when current passes through it due to heat loss this strip is going to increase it's length, and as a result the circuit is going to disconnected.
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Actually starter works with choke coil, to release photon from tube light it is required to ionized the tube gas and for starting stage it requires high voltage, now concept E= L*di/dt when rate of change of current is high then emf will be high, so starter works very fast and when the voltage reaches at required limit to start the tube then starter out from circuit of tube light electrically.
My next video will describe the inner parts of a electrical choke or ballast.
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