COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 21, Problem 7QAP
To determine
(a)
To explain what a transformer is.
To determine
(b)
To explain how it changes the voltage input to some different voltage input.
To determine
(c)
Will a transformer work with a dc input.
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Chapter 21 Solutions
COLLEGE PHYSICS
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- Check Your Understanding A transformer steps the line voltage down from 110 to 9.0 V so that a current of 0.50 A can be delivered to a doorbell (a) What is the ratio of the number of turns in the primary and secondary windings? (b) What is the current in the primary winding? (c) What is the resistance seen by the 110-V source?arrow_forwardAn emf of 9.7 × 10-3 V is induced in a coil while the current in a nearby coil is decreasing at a rate of 2.7 A/s. What is the mutual inductance of the two coils?arrow_forwardDo Kirchhoff’s rules apply to circuits that contain inductors and Capacitors?arrow_forward
- What is the resonant frequency of a 0.500 mH inductor connected to a 40.0 (F capacitor?arrow_forwardAn emf of 0.40 V is induced across a coil when the current through it changes uniformly from 0.10 to 0.60 A in 0.30 s. What is the self-inductance of the coil?arrow_forwardConstruct Your Own Problem Consider a double transformer to be used to create very large voltages. The device consists of two stages. The first is a transformer that produces a much larger output voltage than its input. The Output of the first transformer is used as input to a second transformer that further increases the voltage. Construct a problem in which you calculate the output voltage of the final stage based on the input voltage of the first Stage and the number of turns or loops in bath parts of both transformers (four coils in all). Also calculate the maximum output current of the final stage based on the input current. Discuss the possibility of power losses in the devices and the effect on the output current and power.arrow_forward
- Why does a transformer require ac?arrow_forwardA transformer has Np = 500 turns on the primary coil and Ns = 60 turns on the primary coil secondary. (a) What kind of transformer is this? (b) By what factor does this transformer change the voltage and the AC current?arrow_forwardWhat is Electromagnetic Induction (EMI)? Differentiate a transformer with a generator?arrow_forward
- From time to time, transformers explode. If your neighborhood has ever lost power all at once, this is likely to be one of the reasons. To illuminate why this happens, consider the transformer box in your neighborhood: It needs to take the 7200 V from the power lines and transform it to 120 V, which you will use in your home. (a) If the secondary coil has 40 turns, how many turns does the primary coil have? (b) If the 7200 V coil and the 120 V coil are separated by a distance of 30 cm, calculate the electric field that exists between them. (c) How much energy is stored in this electric field, if the total volume enclosed between the transformer is 0.6 m³? Do you think this is enough to cause an explosion? [If you're curious, the real reason is because they contain a mineral oil that is used for insulation. If there is a short circuit, lightning strike, or if the temperature otherwise gets too high, the oil begins to vaporize, forming bubbles of hydrogen and methane, which is highly…arrow_forwardA step down transformer produces produces a voltage of 6 volts across the sec- ondary coil when the voltage across the primary coil is 120 V. If we now drove this circuit in the reverse direction, what voltage appears across the original primary coil when 120 V is applied to the original sec- ondary coil?arrow_forwardSurely upvote you.arrow_forward
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