Physics of Everyday Phenomena
9th Edition
ISBN: 9781260048469
Author: Griffith
Publisher: MCG
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Chapter 13, Problem 30CQ
To determine
Whether it is reasonable to connect a fuse in parallel with other appliances in a circuit.
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Which statements are true?
a) At any junction point in a circuit, the sum of all the currents entering the junction must equal the sum of all the currents leaving the junction.
b) The sum of the changes in potential around any closed loop of a circuit must equal zero.
c) Kirchoff's junction rule is based on the conservation of energy.
d) Kirchoff's loop rule is based on the conservation of charge.
You wish to measure both the current through and the potential difference across some component of a circuit. It is not possible to do this simultaneously and accurately with ordinary voltmeters and ammeters. Explain why not.
Why is it dangerous to use an electric shaver while taking a bath?
and
What do you mean by short circuit? Explain.
Chapter 13 Solutions
Physics of Everyday Phenomena
Ch. 13 - Two arrangements of a battery, bulb, and wire are...Ch. 13 - Suppose you have two wires, a battery, and a bulb....Ch. 13 - In a simple battery-and-bulb circuit, is the...Ch. 13 - Are electric current and electric charge the same...Ch. 13 - When an axon is stimulated, a voltage spike or...Ch. 13 - Does the signal in an axon travel at the same...Ch. 13 - Consider the circuit shown, where the wires are...Ch. 13 - Consider the circuit shown. Could we increase the...Ch. 13 - Two circuit diagrams are shown. Which one, if...Ch. 13 - Suppose we use an uncoated metal clamp to hold the...
Ch. 13 - Consider the two signs shown, which are located in...Ch. 13 - If we decrease the potential difference across a...Ch. 13 - Prob. 13CQCh. 13 - When a battery is being used in a circuit, will...Ch. 13 - Two resistors are connected in series with a...Ch. 13 - In the circuit shown below. R1, R2,. and R3 are...Ch. 13 - In the circuit shown in question 16, which of the...Ch. 13 - If we disconnect R2, from the rest of the circuit...Ch. 13 - When current passes through a series combination...Ch. 13 - In the circuit shown, the circle with a V in it...Ch. 13 - In the circuit shown, the circle with an A in it...Ch. 13 - Which will normally have the larger resistance, a...Ch. 13 - Is electric energy the same as electric power?...Ch. 13 - If the current through a certain resistance is...Ch. 13 - Prob. 25CQCh. 13 - What energy source increases the potential energy...Ch. 13 - Prob. 27CQCh. 13 - Prob. 28CQCh. 13 - Prob. 29CQCh. 13 - Prob. 30CQCh. 13 - Prob. 31CQCh. 13 - Prob. 32CQCh. 13 - Why does a bimetallic strip bend when the...Ch. 13 - A charge of 28 C passes at a steady rate through a...Ch. 13 - A current of 4.5 A flows through a battery for 3...Ch. 13 - Prob. 3ECh. 13 - A current of 1.5 A is flowing through a resistance...Ch. 13 - A current of 0.522 A flows through a resistor with...Ch. 13 - Four 22 resistors are connected in series to an...Ch. 13 - A 47 resistor and a 28 resistor are connected in...Ch. 13 - In the circuit shown, the 1 resistance is the...Ch. 13 - Three resistors are connected to a 12-V battery as...Ch. 13 - Two resistors, each having a resistance of 40 ....Ch. 13 - Prob. 11ECh. 13 - Three identical resistances, each 30 , are...Ch. 13 - A 9-V battery in a simple circuit produces a...Ch. 13 - A 80 resistor has a voltage difference of 12 V...Ch. 13 - A 75-W light bulb operates on an effective ac...Ch. 13 - A toaster draws a current of 9.0 A when it is...Ch. 13 - A clothes dryer uses 6600 W of power when...Ch. 13 - In the circuit shown, the internal resistance of...Ch. 13 - Three 36 lightbulbs are connected in parallel to...Ch. 13 - In the circuit shown, the 8-V battery is opposing...Ch. 13 - In the combination of 12 resistors shown in the...Ch. 13 - A 850-W toaster, a 1200-W waffle iron, and a...
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- In places such as hospital operating rooms or factories for electronic circuit boards, electric sparks must be avoided. A prison standing on a grounded floor and touching nothing else can typically have a body capacitance of 150 pF, in parallel with a foot capacitance of 80.0 pF produced by the dielectric soles of his or her shoes. The person acquires static electric charge from interactions with Ills or her surroundings. The static charge flows to ground through the equivalent resistance of the two shoe soles in parallel with each other. A pair of rubber-soled street shoes can present an equivalent resistance of 5.00 103 M. A pair of shoes with special static-dissipative soles can have an equivalent resistance of 1.00 M. Consider the persons body and shoes as forming an RC circuit with the ground. (a) How long does it take the rubber-soled shoes to reduce a persons potential from 3.00 103 V to 100? (b) How long does it take the static-dissipative shoes to do the same thing?arrow_forwardA 120-V immersion heater consists of a coil of wire that is placed in a cup to boil the water. The heater can boil one cup of 20.00°C water in 180.00 seconds. You buy one to use in your dorm room, but you are worried that you will overload the circuit and nip the 15.00-A, 120-V circuit breaker, which supplies your dorm room. In your dorm room, you have four 100.00-W incandescent lamps and a 1500.00-W space heater, (a) What is the power rating of the immersion heater? (b) Will it trip the breaker when everything is turned on? (c) If it you replace the incandescent bulbs with 18.00-W LED, will the breaker nip when everything is turned on?arrow_forwardFoolishly trying to fish a burning piece of bread from a toaster with a metal butter knife, a man conies into contact with 120-V AC. He does not even feel it since, luckily, he is wearing rubber-soled shoes. What is the minimum resistance of the path the current follows through the person?arrow_forward
- When working with high-power electric circuits, it is advised that whenever possible, you work "one-handed” or “keep one hand in your pocket." Why is this a sensible suggestion?arrow_forwardShow that if two resistors R1and R2are combined and one is much greater than the other (R 1 >>R 2 ): (a) Their series resistance is very nearly equal to the greater resistance R 1. (b) Their parallel resistance is very nearly equal to smaller resistance R2.arrow_forwardFind the current through a person and identify the likely effect on her if she touches a 120-V AC source: (a) if she is standing on a rubber mat and offers a total resistance of 300 k; (b) if she is standing barefoot on wet grass and has a resistance of only 4000 k .arrow_forward
- A man foolishly tries to fish a burning piece of bread from a toaster with a metal butter knife and comes into contact with 120-V ac. He does not even feel it since, luckily, he is wearing rubber-soled shoes. What is the minimum resistance of the path tire current follows through the person?arrow_forwardThe immediate cause of many deaths is ventricular fibrillation, an uncoordinated quivering of the heart, as opposed to proper beating. An electric shock to the chest can cause momentary paralysis of the heart muscle, after which the heart will sometimes start organized beating again. A defibrillator is a device that applies a strong electric shock to the chest over a time of a few milliseconds. The device contains a capacitor of a few microfarads, charged to several thousand volts. Electrodes called paddles, about 8 cm across and coated with conducting paste, are held against the chest on both sides of the heart. Their handles are insulated to prevent injury to the operator, who calls Clear! and pushes a button on one paddle to discharge the capacitor through the patient's chest Assume an energy of 3.00 102 W s is to be delivered from a 30.0-F capacitor. To what potential difference must it be charged?arrow_forwardThree capacitors with capacitances 4 μF, 6 μF, and 8 μF are connected in parallel. This combination is then connected in series with a 12 μF capacitor. What is the total equivalent capacitance of this circuit? A) 4 μF B) 7.2 μF C) 12.6 μF D) 24 μFarrow_forward
- Create an illustration of a series circuit that connects a battery and five capacitors and with a total capacitance of 3/7 F. The total charge in the circuit must be 2/9 C.arrow_forwardBased on the circuit shown below, according to Kirchoff’s current rule, thecurrent in point b is equal to the current in a. point cb. point dc. point c+dd. indeterminate Based on the circuit shown below, according to Kirchoff’s current rule, the emf inthe battery is equal to the potential difference measured between a. points a and bb. points b and cc. points c and dd. points a and darrow_forwardThe battery supplies a maximum voltage of 12 V. When it is connected to an external circuit, the voltage measured by the voltmeter across the circuit is only 10 V. Is this possible? Explain your answerarrow_forward
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