Exampro a-level Physics (7407/7408)
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3.4.1.8-Conservation-of-energy
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(6)
(b) The turbines drive generators that produce alternating current at an rms potential difference of 25 kV which is then stepped up to an rms potential difference of 275 kV by means of a transformer. (i) Calculate the rms current supplied by the generators to the transformer when the power output of the generators is 2.0 MW. ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... (ii) The transformer has an efficiency of 95%. Calculate the output current of the transformer. ............................................................................................................... ............................................................................................................... ............................................................................................................... ............................................................................................................... (4) (Total 10 marks) Q16. A simple pendulum consists of a 25 g mass tied to the end of a light string 800 mm long. The mass is drawn to one side until it is 20 mm above its rest position, as shown in the diagram. When released it swings with simple harmonic motion. (a) Calculate the period of the pendulum. ...................................................................................................................... ...................................................................................................................... Download 0.7 Mb. Do'stlaringiz bilan baham: 
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