Related questions
Question
![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 combustible.]](https://content.bartleby.com/qna-images/question/82dd1d29-7049-45b8-a9a7-805a4d4d6374/4616c71a-f2de-41f2-ab36-89b5930474d7/dea61jv_processed.jpeg)
Transcribed Image Text: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 combustible.]
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by stepSolved in 4 steps
Knowledge Booster
Similar questions
- A soldering gun contains a transformer that lowers the 120 V from an outlet to a few volts. It’s possible to have a current of 150 A in the tip of the soldering iron even though the outlet has a circuit breaker that permits no more than 15 A. Explain how this is possible.arrow_forwardA transformer has 558 turns on its primary and 101 turns on its secondary.(b) If a voltage of 125 V is applied to the primary and a current of 0.35 A flows in these windings, what are the voltage output of the secondary and the current in the secondary? (a)voltage (b)currentarrow_forwardThe primary coil of a transformer has 50 turns and its secondary coil has 200 turns, and the current in the primary coil is 40 A. When a 120 V alternating current is applied to the primary coil of the transformer, (i). what is the voltage in the secondary coil? (ii) what is the current in the secondary coil? (iii) calculate the power of the transformer. (iv) what type of transformer is this? Explain your reasoning.arrow_forward
- A generator supplies (1.049x10^2) V to the primary coil of a transformer. The primary has 500 turns and the secondary has 50 turns. What is the secondary voltage? Use kV for your answer and four significant figures. Note: Your answer is assumed to be reduced to the highest power possible.arrow_forwardSpike left his car headlights on overnight and the battery has gone flat. Carly suggests that rather than using her car to recharge the battery they instead build a battery charger so he can do it himself. She suggests that he modify an old transformer that they don't need anymore to do the job. The old transformer has a primary coil of 309 turns. It will need to be connected to mains voltage (240 V) and put out a voltage of 11 V to charge the car battery. How many turns should Spike wind to make the secondary coil? (No decimals, no units)arrow_forwardA generating station is producing 1.4 x 106 W of power that is to be sent to a small town located 5.6 km away. Each of the two wires that comprise the transmission line has a resistance per length of 4.5 x 10-2/km. (a) Find the power lost in heating the wires if the power is transmitted at 1600 V. (b) A 100:1 step-up transformer is used to raise the voltage before the power is transmitted. How much power is now lost in heating the wires?arrow_forward
- (a)The primary of a step-up transformer connected to a 120 V source has 200 turns. If the output is 480 V, how many turns does the secondary have? (b)The primary of a step-down transformer connected to a 240 V source has 1500 turns. The secondary has 200 turns. What is the output voltage of this transformer? (c)A laptop computer requires 24 volts to operate properly. A transformer with 600 turns in the primary needs to have how many turns in the secondary to operate the computer from a 120 V source?arrow_forwarda step down transformer has an output of 12v and .5A when connected to a 120V line. assume no losses. (a) what is the ratio of primary to secondary loops? (b) what current does the transformer draw from the line. (c) what is the power output of the transformerarrow_forwardA plug-in transformer supplies 9.00 V to a video game system. (a) How many turns are in its secondary coil if its input voltage is 120 V and the primary coil has 391 turns? turns (b) What is its input current when its output is 1.29 A? Aarrow_forward
- A multipurpose transformer has a secondary coil with several points at which a voltage can be extracted, giving outputs of 5.60, 12.0, and 480 V. (a) The input voltage is 160 V to a primary coil of 200 turns. What are the numbers of turns in the parts of the secondary used to produce the output voltages? 5.60 V turns 12.0 V turns 480 V turns (b) If the maximum input current is 5.50 A, what are the maximum output currents (in A) (each used alone)? 5.60 V 12.0 V 480 V AAAarrow_forwardA primary coil of a transformer is connected to a 120V source and draws a 12 A. The secondary coil has 800 turns and a current of 4.0 A. What is the voltage in the secondary coil?arrow_forwardA step-up transformer is designed so that the output of its secondary winding is 2000 V when the primary winding is connected to a 110-V line voltage. If there are 100 turns in the primary winding, how many turns are there in the secondary winding? 1820 2200 200 18arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios