An Introduction to Physical Science
14th Edition
ISBN: 9781305079137
Author: James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres
Publisher: Cengage Learning
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Chapter 8, Problem 13MC
To determine
The true point of a step-up transformer.
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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
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#8
A transformer has 770 primary and 190 secondary turns. An alternating potential of
50 V is applied to the primary. What is the secondary potential? (in V)
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Chapter 8 Solutions
An Introduction to Physical Science
Ch. 8.1 - What is the difference between the law of charges...Ch. 8.1 - Prob. 2PQCh. 8.2 - Prob. 1PQCh. 8.2 - Prob. 2PQCh. 8.2 - A coffeemaker draws 10 A of current operating at...Ch. 8.3 - Prob. 1PQCh. 8.3 - Prob. 2PQCh. 8.3 - Prob. 8.2CECh. 8.4 - How are the law of poles and the law of charges...Ch. 8.4 - Where is the Earth's north magnetic pole located?
Ch. 8.5 - What are the two basic principles of...Ch. 8.5 - What's the difference between a motor and a...Ch. 8.5 - Prob. 8.3CECh. 8 - KEY TERMS 1. electric charge (8.1) 2. electrons 3....Ch. 8 - Prob. BMCh. 8 - Prob. CMCh. 8 - Prob. DMCh. 8 - Prob. EMCh. 8 - Prob. FMCh. 8 - Prob. GMCh. 8 - Prob. HMCh. 8 - Prob. IMCh. 8 - Prob. JMCh. 8 - Prob. KMCh. 8 - Prob. LMCh. 8 - Prob. MMCh. 8 - Prob. NMCh. 8 - Prob. OMCh. 8 - Prob. PMCh. 8 - Prob. QMCh. 8 - Prob. RMCh. 8 - Prob. SMCh. 8 - Prob. TMCh. 8 - Prob. UMCh. 8 - Prob. VMCh. 8 - Prob. WMCh. 8 - Prob. XMCh. 8 - Prob. YMCh. 8 - Which of the following has a positive (+) charge?...Ch. 8 - Two equal positive charges are placed equidistant...Ch. 8 - In a dc circuit, how do electrons move? (8.2) (a)...Ch. 8 - What is a unit of voltage? (8.2) (a) joule (b)...Ch. 8 - The ohm is another name for which of the...Ch. 8 - Appliances with heating elements require which of...Ch. 8 - The greatest equivalent resistance occurs when...Ch. 8 - Prob. 8MCCh. 8 - Prob. 9MCCh. 8 - Prob. 10MCCh. 8 - What type of energy conversion does a motor...Ch. 8 - What type of energy conversion does a generator...Ch. 8 - Prob. 13MCCh. 8 - A transformer with more windings on the primary...Ch. 8 - Prob. 1FIBCh. 8 - ___ are neither good conductors nor good...Ch. 8 - Prob. 3FIBCh. 8 - Voltage is defined as work per___. (8.2)Ch. 8 - An electric circuit that is not a complete path is...Ch. 8 - Prob. 6FIBCh. 8 - Prob. 7FIBCh. 8 - Prob. 8FIBCh. 8 - Prob. 9FIBCh. 8 - Prob. 10FIBCh. 8 - Prob. 11FIBCh. 8 - Prob. 12FIBCh. 8 - Prob. 1SACh. 8 - A large charge +Q and a small charge q are a short...Ch. 8 - Explain how a charged rubber comb attracts bits of...Ch. 8 - Why do clothes sometimes stick together when...Ch. 8 - Prob. 5SACh. 8 - Prob. 6SACh. 8 - Prob. 7SACh. 8 - If the drift velocity in a conductor is so small,...Ch. 8 - Prob. 9SACh. 8 - Why are home appliances connected in parallel...Ch. 8 - Compare the safety features of (a) fuses, (b)...Ch. 8 - Prob. 12SACh. 8 - Sometimes resistances in a circuit are described...Ch. 8 - Why do iron filings show magnetic field patterns?Ch. 8 - Compare the law of charges and the law of poles.Ch. 8 - Prob. 16SACh. 8 - What is the principle of an electromagnet?Ch. 8 - (a) What does the Earths magnetic field resemble,...Ch. 8 - Describe the basic principle of a dc electric...Ch. 8 - What happens (a) when a proton moves parallel to a...Ch. 8 - Prob. 21SACh. 8 - Prob. 22SACh. 8 - Prob. 23SACh. 8 - Body injury from electricity depends on the...Ch. 8 - Prob. 1VCCh. 8 - Prob. 1AYKCh. 8 - Prob. 2AYKCh. 8 - Answer both parts of Question 2 for a charge of +1...Ch. 8 - An old saying about electrical safety states that...Ch. 8 - Prob. 5AYKCh. 8 - Prob. 6AYKCh. 8 - Prob. 7AYKCh. 8 - Suppose you are on an expedition to locate the...Ch. 8 - How many electrons make up one coulomb of charge?...Ch. 8 - An object has one million more electrons than...Ch. 8 - What are the forces on two charges of +0.60 C and...Ch. 8 - Find the force of electrical attraction between a...Ch. 8 - There is a net passage of 4.8 1018 electrons by a...Ch. 8 - A current of 1.50 A flows in a conductor for 6.5...Ch. 8 - To separate a 0.25-C charge from another charge,...Ch. 8 - Prob. 8ECh. 8 - If an electrical component with a resistance of 50...Ch. 8 - What battery voltage is necessary to supply 0.50 A...Ch. 8 - A car radio draws 0.25 A of current in the autos...Ch. 8 - A flashlight uses batteries that add up to 3.0 V...Ch. 8 - How much does it cost to run a 1500-W hair dryer...Ch. 8 - Prob. 14ECh. 8 - A 24- component is connected to a 12-V battery....Ch. 8 - Prob. 16ECh. 8 - The heating element of an iron operates at 110 V...Ch. 8 - A 100-W light bulb is turned on. It has an...Ch. 8 - Two resistors with values of 25 and 35 ,...Ch. 8 - Prob. 20ECh. 8 - A student in the laboratory connects a 10-...Ch. 8 - Prob. 22ECh. 8 - A 30.0- resistor and a 60.0- resistor in series...Ch. 8 - A 30.0- resistor and a 60.0- resistor in parallel...Ch. 8 - Prob. 25ECh. 8 - A transformer has 600 turns on its primary and 200...Ch. 8 - A transformer with 1000 turns in its primary coil...Ch. 8 - A power company transmits current through a...
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- At what angular velocity in rpm will the peak voltage of a generator be 480 V. if its 500-turn, 8.00 cm diameter coil rotates in a 0.250 T field?arrow_forwardAaBbCcD AaBbCcDe AaBbC AaBbCcC AaB T No Spac.. Headıng 1 Heading 2- Title T Normal Styles Paragraph A. Calculate the secondary number of turns of the given transformer and Identify the types used. Types of Transformer Number Turns Primary (Np) 30 Turns 130 Turns 10 Turns 24 Turns 110 Turns 5 Turns Secondary Voltage (Vs) 12-V 220-V 24-V Number Turns Primary Voltage (Vp) 60-V 110-V 5-V 12-V 220-V 45-V1 Secondary (Ns) 60-V 240-V 110-V B. Differentiate Step-Down transformer from Step-Up Transformer. のarrow_forwardThe primary coil of an ideal transformer provides 100 W of power. If the emf of the secondary coil is 10 V, how much current flows through the secondary coil? 2 UNANSWERED QUESTION 2/2 1000 A 100 A 1 A 10 Aarrow_forward
- A transformer has 400 turns on its secondary and 100 turns on its primary. The primary is connected to a 10-V source. (a) What is the voltage output of the secondary? X V Enter a number. (b) If 1 A flows in the primary coil, how much current is there in the secondary coil? Need Help? Talk to a Tutor Read It Submit Answer O vA 11:45 esc @ #3 24 % & backspace 2 3 4 6 8 1 e y i tab k a shiftarrow_forwardA 10-V, 1.0-A dc current is run through a step-up transformer that has 10 turns on the input side and 20 turns onthe output side. What is the output?(a) 10 V, 0.5 A.(b) 20 V, 0.5 A.(c) 20 V, 1 A.(d) 10 V, 1 A.(e) 0 V, 0 A.arrow_forwardQuestion 8 900 turns 2200 3400 2 3 500 2 turns 3.3 k2 Calculate all voltages and all currents in this transformer circuit, assuming the 3.3 k2 resistor drops 40 volts. 000000000 ell-arrow_forward
- Spike 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_forwardThe charger for your cell phone contains a small transformer. While charging, it provides 5.0 W to your phone at 5.0 V. Assuming an ideal transformer, how much current does this transformer draw from the 120 V wall socket?arrow_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
- Calculate the peak voltage (in V) of a generator that rotates its 180 turn, 0.100 m diameter coil at 3600 rpm in a 0.830 T field.arrow_forwardWhen a 240 V power supply supplies current which changes direction 100 times per second to the current X. Current is detected in coil Y. Describe above situation according to the physics understanding. Now the output of coil Y is connected to a 12 V,3A light bulb. The bulb, light with full intensity. By using the concept of energy and assuming 100% energy efficiency between the two coils, calculate the current in coil X.arrow_forwardThe primary coil of a transformer is coupled to DC power supply (a battery) that provides an electromotive force of 9V. The primary coil has 10 turns while the secondary coil has 100 turns. Determine the potential difference across the secondary coil. Provide your answer in Volts.arrow_forward
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