In a hydroelectric installation, a turbine delivers 1500 hp to a generator, whic

Question

In a hydroelectric installation, a turbine delivers 1500 hp to a generator, which in turn transfers 80.0% of the mechanical energy out by electrical transmission. Under these conditions, what current does the generator deliver at a terminal potential difference of 1620 V? A certain waffle Iron is rated at 0.74 kW when connected to a 120-V source. What current does the waffle Iron carry? What is its resistance? The potential difference across a resting neuron in the human body is about 135.0 mV and carries a current of about 1.340 mA. How much power does the neuron release?

Explanation / Answer

14) Ptotal =1500 hp =1.11855*10^6 W, V =1620 V

80% power converted in electrical power

P = 0.8*1.11855*10^6

P = IV

0.8*1.11855*10^6 =I* 1620

I =552.4 A

15) (a) P =0.74 kW, V =120 V

Power =IV

740 =I*120

I = 6.17 A

(b) From ohms law V =iR

120 = 6.17*R

R =19.46 ohm

16) V =135 mV, i =1.34 mA

P =VI =135*1.34*10^-6 = 180.9 uW

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