The following graph represents one cycle of AC current through the primary coilof a transformer.I II IIItICurrent in Primary CoilThe secondary coil of the transformer is attached to a light bulb. There are fourlabelled points in the cycle of AC current through the primary coil. At which ofthese four points will the magnitude of the current induced in the secondary coilbe the greatest?A. IB. IIC. IIID. IV11111

A transformer has 400 turns on the primary and 100 turns on the secondary. If 120 volts AC are applied across the primarywindings, calculate the voltage induced in the secondary.

A steady current is passing through a coil, magnitude of self- induced emf in it,will be:A. zero ⃝ B. maximum

A coil of resistance 10Ω and inductance 140mH is connected in parallel with a 260Ωresistor across a 230V, 50Hz supply. Calculate the following(i) Current in the coil and phase angle of this current (4 Marks)(ii) Supply current (4 Marks)(iii) Circuit impedance (3 Marks)(iv) Power factor (3 Marks)(v) Power consumed

A series ac circuit consists of a voltage source of frequency 60 Hz and source voltage amplitude 345 volts, a 701-Q resistor, a 1.6 - uF capacitor, and an inductor of inductance L.(a) What must be the value of L for the phase angle to be zero? (b) When L has the value calculated in part (a), what is the current amplitude in the circuit?

A square-wave voltage of 100V with frequency of 60Hz is applied on a coilwound on a closed iron core. The coil has 500 turns, and the cross-section areaof the core is 0.001m2. If the core has no resistance, determinea) the maximum value of flux;b) the maximum value of voltage with the maximum flux density of 1.2T