What is knee voltage?

A diode is connected to 220V (r.m.s) a.c. in series with a capacitor as shown in the figure. What is the voltage V across the capacitor is

Trune ratio in a step up trnsfromer is 1:2, if a Lechlanche cell of 1.5 V is conneted across the input, what is the voltage across the output?

The peak voltage of an ac supply is 300 V. What is the rms voltage?

What is breakdown voltage range of a zener diode?

What is the largest voltage you can safely put across a resistor marked 98 Omega-0.5 W ?

Assume that the silicon diode in the circui shown in fig. requires a minimum current of 1mA to be above the knee point (0.7V) of its I-V characteristics. Aslo assume that the voltage across the diode is independent of current above the knee point. If V_(B)=5 V, what should be the maximum value of R so that the voltage is above the knee point?

Assume that the silicon diode in the circui shown in fig. requires a minimum current of 1mA to be above the knee point (0.7V) of its I-V characteristics. Aslo assume that the voltage across the diode is independent of current above the knee point. If R=1kOmega , what is the minimum voltage V_(B) required to keep the diode above the knee point?

Assume that the silicon diode in the circui shown in fig. requires a minimum current of 1mA to be above the knee point (0.7V) of its I-V characteristics. Aslo assume that the voltage across the diode is independent of current above the knee point. What is the power dissipated in the resistance R and in the diode, when a current of 5mA flows in the circuit at V_(B)=6V ?