The value for a ZnO varistor is 15 and k₁=9.3 x 10-38, the potential difference and current being measured in volts and amps respectively. Calculate the p.d. across the varistor for currents of 0.1, 1, 10, 100 and 1000 A. If a device needs protection against transient voltages in excess of 300 V, show how a varistor having the characteristic defined above can be connected to afford protection.

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Design a 15 V Zener regulator for the following conditions: 1) The load current IL ranges from 200 mA to 300 mA.2) The source voltage ranges from 21 V to 25 V. Based on your design results,a) Draw the Zener regulator circuit.b) Calculate the power ratings for both Zener diode and resistor Ri

A crystalline silicon photovoltaic cell has an open circuit voltage of 0.5V and a short circuit current of 1.8 A at Standard Test Conditions. What is the maximum output power at Standard Test Conditions and at a cell temperature of 50oC? What is the percentage decrease in power per oC? Assume a Fill Factor of 0.70 at 25oC. (As a rule of thumb for crystalline silicon solar cells, the increase in short circuit current is about 0.058% per oC while the decrease on open circuit voltage is 0.30% per oC and decrease in the fill factor is by 0.15% per oC).