RLC Series Circuit

Fully charged capacitor

At t = 0, switch S is closed

Like LC circuitcapacitor dischargesCurrent oscillatesResistor dissipates current

RLC Series Circuit

RLC Series Circuit

underdamped

Transformers

Seatwork 21. Electrical oscillations are initiated in a series circuit containing a capacitance C,inductance L, and resistance R.

(a) If ≪ 4 / (weak damping), how much time elapses before the amplitudeof the current oscillation falls of to 50.0% of its initial value?

(b) How long does it take the energy (of the capacitor) to decrease to 50.0% of itsinitial value?

2. The primary coil of a transformer contains 100 turns; the secondary has 200 turns.The primary coil is connected to a size AA battery that supplies a constant voltage of 1.5volts. What voltage would be measured across the secondary coil?

3. A transformer is intended to decrease the rms value of the alternating voltagefrom 500 volts to 25 volts. The primary coil contains 200 turns. Find the necessarynumber of turns in the secondary coil.

4. A transformer is intended to decrease the rms value of the alternatingcurrent from 500 amperes to 25 amperes. The primary coil contains 200 turns.Find the necessary number of turns in the secondary coil.

5. The primary coil of a transformer has 200 turns and the secondary coil has 800turns. The power supplied to the primary coil is 400 watts. What is the powergenerated in the secondary coil if it is terminated by a 20-ohm resistor?