INTRO TO PHYSICAL SCIENCE W/MINDTAP
14th Edition
ISBN: 9781337077026
Author: Shipman
Publisher: CENGAGE L
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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
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…
A transformer has 20 turns of wire in its primary coil and 80 turns on its secondary coil.
(a) Is this a step-up or step-down transformer?
step-up or
step-down
(b) If an alternating voltage with an effective voltage of 140.0 V is applied to the primary, what is the effective voltage induced in the secondary? V?
A step-up transformer is designed so that the output of its secondary winding is 240 V when
the primary winding is connected to a 120-V line voltage.
(a) If there are 100 turns in the primary winding, how many turns are there in the secondary
winding?
(b) If the coffee grinder in an espresso machine connected across the secondary winding has
a power rating of 240W, what is the current in the primary winding?
Chapter 8 Solutions
INTRO TO PHYSICAL SCIENCE W/MINDTAP
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- 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_forwardWhich of the following statements about transformers is false?(a) Transformers work using ac current or dc current.(b) If the current in the secondary is higher, the voltage islower.(c) If the voltage in the secondary is higher, the current islower.(d) If no flux is lost, the product of the voltage and thecurrent is the same in the primary and secondary coils.arrow_forwardA plug-in transformer, as shown, 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 400 turns? (b) What is its input current when its output is 1.30 A?arrow_forward
- a 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_forwardFastarrow_forwardDoes a transformer work when a DC current flows through the primary? If not, why?arrow_forward
- 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) Submit Answer Tries 0/2arrow_forwardA transformer has 300 turns on its secondary and 100 turns on its primary. The primary is connected to a 12-V source. (a) What is the voltage output of the secondary?(b) If 2.0 A flows in the primary coil, then how much current is there in the secondary coil?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_forward
- A transformer has 600 turns on its secondary and 100 turns on its primary. The primary is connected to a 20-V source. (a) What is the voltage output of the secondary? V (b) If 3 A flows in the primary coil, how much current is there in the secondary coil? Aarrow_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_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
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