Assume that emf is induced at the terminals of a solenoid loca Encirele what you
ID: 1875014 • Letter: A
Question
Assume that emf is induced at the terminals of a solenoid loca Encirele what you think is true a) The induced emf functions as a voltage source and is measured in Volts b) The induced emf functions as a current source and is measured in Amperes c) The induced emf has nothing to do with voltage and current. d) None of the above. ted in a changing magnetic flux 7. Assume that emf is induced in a closed ring of wire located in a changing magnetic flux. Encircle what you think is true: a) The induced emf produces a current in the closed ring of wire because the ring is a closed circuit for current b) The induced emf does not produce a current in the ring. c) None of the above 8. 9. Assume that emf is induced in a wire located in a changing magnetic flux. The wire does not make a closed loop. Encircle what you think is true: a) The induced emf produces a current in the wire because the wire is a conductor b) The induced emf does not produce a current in the wire because the wire is not a closed circuit for current. c) None of the above 10. Assume that emf is induced in a closed ring made of glass located in a changing magnetic flux. Encircle what you thnk is true: a) The induced emf produces a current in the ring of glass because the ring makes a closed circuit for current b) The induced emf does not produce a current in the ring of glass because glass is not a conductor for current. c) None of the above. 11. Encircle what you think is true: a) Transformers are used to increase ac voltage. b) Transformers are used to decrease ac voltage c) Transformers are used to increase ac current. d) Transformers are used to decrease ac current. e) Transformers are used only with ac current f Transformers are used with dc current. g) None of the above.Explanation / Answer
7) a
8) a
9)b
10)b
11) a,b,c,d,e. Transformer is a device used to transfer power. Hence product of current and voltage in primary and secondary is constant.
If it is used to increase AC voltage it is called stepup transformer then ac current will decrease.
If it is used to decrease AC voltage it is called stepdown transformer then AC current will increase.
Generally it is used in AC circuits, it works on mutual induction.