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Select an appropriate hardness test for each of the following materials, and justify your answer: a) Cubic Boron Nitride b) Lead c) Cold Drawn 0.5%C steel d) Diamond e) Caramel Candy f) Granite
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A hair dryer consumes P=1600 Watts of power from a 120 V wall plug. a) What current does the hairdryer draw? b) The current is carried from the breaker box to the power outlet by a 14-gauge copper w
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What is the scientific reason for fly-away hair?
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An electricity company charges its customers a fixed base charge of $6 a month, plus 10 cents per kilowatt-hour (kWh) for the first 500 kWh, 11 cents per kWh for the next 500 kWh, and 15 cents for all additional kWh. (a) Express the monthly cost E as a f
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For a Faraday ice pail, the principle of its operation relies on the proportionality between the charge on the inner pail and the potential difference between the inner pail and the ground. Suppose the relationship between charge q and potential differenc
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A light bulb marked “25 W (at) 120 V” is screwed into a socket at one end of a long extension cord in which each of the two conductors has resistance of 0.600 Ohms. The other end of the extension cord is plugged into a 120 V outlet. Draw a circuit diagram
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Car batteries are often rated in amp-hours. This rating indicates the quantity of charge that can pass through the battery before the battery’s chemical energy must be restored by the car’s generator or some other source. The amp-hour unit is convenient f
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What metal is usually used for wires in electric circuits?
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Explain the difference between charging by induction and charging by contact. Include details of how the charging occurs.
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Electricity
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A small electric heater takes a power of 60 W from a 12 V supply. a. What is the current in the heater? b. What is the resistance of the heater? c. How much charge (in C) passes through the heater in 20 seconds? d. How much energy (in J) is transformed by
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What are the main parts of a fuel cell?
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How are lights in schools usually wired? Series or parallel circuits?
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Calculate the standard cell emf (in V) for galvanic cells for the cell reaction: 3Zn(s) + 2Bi^3+(aq) => 3Zn^2+(aq) + 2Bi(s)
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Consider a 400 mm 400 mm window in an aircraft. For a temperature difference of 90 o C from the inner to the outer surface of the window, calculate the heat loss rate through L = 12-mmthick polyc
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how much energy is stored in a 9 volt battery rated at 10 a hour
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Which of the following is an energy unit used to express electrical energy? \A) Kilowatt-hour (kWh) \B) Ohms (Ω) \C) Electron-hour \D) Volt (V) \E) Watt (W)
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Electrical circuits have two main problems: “short” and “open”. Define these two conditions with a diagram and an example showing the consequence of each of these faults.
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Is electricity a renewable or nonrenewable resource?
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When a plastic rod is rubbed against cloth,…………… are stripped from the ………………, giving the rod a net …………….. charge.
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How do you calculate the internal resistance of a battery?
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Why does a balloon stick to a wooden wall if the balloon is charged?
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Who was the first person to harness electricity?
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Electricity
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An electron moving from the negative terminal to the positive terminal of a 12 volt battery gains or loses how much energy? Be sure to indicate whether it is a gain or lost in energy. Calculate the electric potential energy of the electron as it moves bet
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How does electric current flow in a circuit?
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In the purely inductive circuit in the figure below, the inductance is 13.9 m H and the rms voltage is 173 V. Find the rms current in the circuit.
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Why do clothes stick together in the dryer?
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A piece of purple plastic is charged with 2.81 times 10^6 extra electrons compared to its neutral state. What is its net electric charge (including its sign) in coulombs? Net electric charge: boxed{space} A glittering glass globe is given a net electr
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Suppose that a (small) charged conductor is connected to the ground. Explain why the conductor becomes uncharged.
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Electrosurgical units (ESUs) supply high-frequency electricity from resonant RLC circuits to cut, coagulate, or otherwise modify biological tissue. (a) Find the resonance frequency (in Hz) of an ESU with an inductance of L = 2.45 mu H and a capacitance of
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The heating element of a coffee maker operates at 120 V and carries a current of 4.50 A. Assuming the water absorbs all of the energy converted by the resistor, calculate how long it takes to heat 0.5
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What type of energy does a flashlight use?
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What is the unit of measurement used for Electric Potential Energy? a. J b. N c. V/m d. N/C e. V f. J/C
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Electricity
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Each of the 884 floodlights at Yankee Stadium uses electrical energy at the rate of 1650 W. How much does it cost to run these lights during a 5-h night game, if electricity costs 21 c/kW.h?
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