(a) The flow of water in a river measured to be 11000 m3 / hour. A 52m waterfall found close to a village at the riverside. It is proposed to install a hydro turbine generator to supply the village with electrical power. (i) Calculate the waterfall power capacity. (ii) Calculate the size of the generator needed to take 85% of the waterfall's capacity. (b) A PV cell has a short circuit current Joh = 5.3 A. the cell temperature is 25 °C, the reverse saturation current lo = 3x10-10 A, and the junction voltage is 0.52 V. neglect the cell shunt and series resistances, (i) Calculate the number of cells required to make a photovoltaic module with the rating of 9 V and 90 W. (ii) Describe the cell connection. (c) A household load consumes 30 kWh of energy for 5 hours of continuous operation per day with a power factor of 0.55. The demand cost as described by the power supply company is 20 Bz/kWh (1000 Bz 1 OMR). (i) Calculate the electricity bill per month. (i) Calculate the household load current if the voltage is 240 V. (iii) Explain the required improvement for the load to reduce the current value.
(a) The flow of water in a river measured to be 11000 m3 / hour. A 52m waterfall found close to a village at the riverside. It is proposed to install a hydro turbine generator to supply the village with electrical power. (i) Calculate the waterfall power capacity. (ii) Calculate the size of the generator needed to take 85% of the waterfall's capacity. (b) A PV cell has a short circuit current Joh = 5.3 A. the cell temperature is 25 °C, the reverse saturation current lo = 3x10-10 A, and the junction voltage is 0.52 V. neglect the cell shunt and series resistances, (i) Calculate the number of cells required to make a photovoltaic module with the rating of 9 V and 90 W. (ii) Describe the cell connection. (c) A household load consumes 30 kWh of energy for 5 hours of continuous operation per day with a power factor of 0.55. The demand cost as described by the power supply company is 20 Bz/kWh (1000 Bz 1 OMR). (i) Calculate the electricity bill per month. (i) Calculate the household load current if the voltage is 240 V. (iii) Explain the required improvement for the load to reduce the current value.
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Transcribed Image Text:(a) The flow of water in a river measured to be 11000 m3 / hour. A 52m waterfall found close
to a village at the riverside. It is proposed to install a hydro turbine generator to supply
the village with electrical power.
(i)
Calculate the waterfall power capacity.
(ii)
Calculate the size of the generator needed to take 85% of the waterfall's capacity.
(b) A PV cell has a short circuit current Joh = 5.3 A. the cell temperature is 25 °C, the reverse
saturation current lo = 3x10-10 A, and the junction voltage is 0.52 V. neglect the cell shunt
and series resistances,
(i)
Calculate the number of cells required to make a photovoltaic module with the rating
of 9 V and 90 W.
(ii)
Describe the cell connection.
(c) A household load consumes 30 kWh of energy for 5 hours of continuous operation per
day with a power factor of 0.55. The demand cost as described by the power supply
company is 20 Bz/kWh (1000 Bz 1 OMR).
(i)
Calculate the electricity bill per month.
(i)
Calculate the household load current if the voltage is 240 V.
(iii)
Explain the required improvement for the load to reduce the current value.
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