Question

Select all answers that are true.

		In a transformer, the input and output wires are not physically connected.
		At short times, a charging inductor behaves like an open switch.
		In an RLC circuit, the resistor drains energy from the circuit.
		Transformers work with AC power sources.
		A capacitor in parallel with a signal source is a low-pass filter.
		Every circuit has some amount of stray capacitance.

Answer 1

1 is true, transformers work on the principle of electromagnetic induction.

2 True, in short period of times, inductors do not allow AC current to pass, so they behave like open switch.

3 True, resistor is the only element which dissipates energy in any circuit.

4 True, Transformers work on the principle of electromagnetic induction, which can only happen in AC currents.

5 True, Capacitors are used in parallel to make low pass filters.

6 True, every circuit has some amount of stray capacitance.