A student wanted to make a 701 Watt toaster for his physics professor. If the toaster will be plugged into a 120 volt electrical outlet, what should be theresistance in ohms of the heater wire to give the desired wattage? (Enter answer as a number with 1 digit to the right of the decimal. Do not enter unit.)A Moving to another c

Power is P=701 watt Voltage is V=120 V

Answered: A student wanted to make a 701 Watt…

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter20: Electric Current, Resistance, And Ohm's Law

Section: Chapter Questions

Problem 90PE: (a) During surgery, a current as small as 20.0 ? applied directly to the heart may cause ventricular...

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(a) During surgery, a current as small as 20.0 ? applied directly to the heart may cause ventricular fibrillation. If the resistance of the exposed heart is 300 , what is the smallest voltage that poses this danger? (b) Does your answer imply that special electrical safety precautions are needed?
A 1,00-?O voltmeter is placed in parallel with a 75.0kresistor in a circuit, (a) Draw a circuit diagram of the connection, (b) What is the resistance of the combination? If the voltage across the combination is kept the same as it was across the 75.0-kresistor alone, what is the percent increase in current? (d) If the current through the combination is kept the same as it was through the 75.0-kresistor alone, what is the percentage decrease in voltage? (e) Are the changes found in parts (c) and (d) significant? Discuss.
The duration of a photographic flash is related to an RC time constant, which is 0.100F for a certain camera, (a) If the resistance of the flash lamp is 0.0400 duringdischarge, what is the size of the capacitor supplying its energy? (b) What is the time constant for charging the capacitor, if the charging resistance is 800 k ?
A. What is the effect on the current in a wire if the voltage is doubled and the resistance is halved? (Let Ohm's law guide your thinking. Let I0 be the initial current and I be the current after the voltage and the resistance are changed.) Express your answer using three significant figures I/I0= B. What is the effect on the current in a wire if the voltage is halved and the resistance is doubled? Express your answer using three significant figures. I/I0=
A2.2 kN and a 4.0 kl resistor are connected in parallel; this combination is connected in series with a 1.3 kN resistor. Part A If each resistor is rated at 0.2 W (maximum without overheating), what is the maximum voltage that can be applied across the whole network? Express your answer using two significant figures. ? Vmax = V
A2.2 kl and a 4.0 kf2 resistor are connected in parallel; this combination is connected in series with a 1.3 k2 resistor. Part A If each resistor is rated at 0.2 W (maximum without overheating), what is the maximum voltage that can be applied across the whole network? Express your answer using two significant figures. Vmax = V
m/s A circuit contains 7 identical resistors connected in series. A 32.3 V battery delivers 58 W of power to the circuit. What is the resistance R of each resistor? O a. 0.08 Q O b. 2.57 O O c. 7.45 A O d. 6.00 V Consider two parallel plate capacitors. Capacitor 1 (C) has a capacitance of 3.2 uF with a vacuum between the plates and the area of the plates of C1 is 9.6 cm². Capacitor 2 (C2) has a plate area of 2.5 cm and a
A the current through the Zohm resistor is 4.0A yoiny from Ча. IZV Left to TCight A what is the Curent în the Othes brunches of the circvit? twhat is the Voltuge dap across the 4 ohm resistor? A What is the Voltage cdrop Across the 3 ohm ru sistor ?
Ohm's law gives the relationship between voltage, resistance, and current in a simple circuit: V = IR. a) Find (dV/dt) in terms of I, R, (dI/dt) and (dR/dt). Assume all quantities are functions of time. b) We have a circuit with 500 Ω resistor, and we ramp up the voltage. How quickly is the current changing when we are increasing the voltage by 10 V/s? It will help to remember that t is the independant variable here. Include units, note that 1Ω = 1V/A. c) Is the current increasing or decreasing? How can you tell?
In the circuit pictured, the resistors have values of R1 = 140 Ω, R2 = 143 Ω, and R3 = 141 Ω, and the battery has an emf ε = 259 V. A. Write an expression for the current through the battery. B. In amperes, how much current ibatt goes through the battery? C. Write an expression for the current through resistor 2. D. In amperes, what is the current i2 through resistor R2?
O Resources Give u R, R, A circuit contains four resistors. Resistor R, has a resistance of 51.0 2, resistor R, has a resistance of 125Q, resistor R3 has a resistance of 75.0 2, and resistor R, has a resistance of 157 2. R, R If the battery has a voltage of V = 45.0 V, how much power is dissipated in each resistor? W P = V P2 = P3 = W P = W about us careers privacy policy terms of use contact us help 87°F Rain comi 近

A 217-ohm lamp, a 124-ohm lamp, and a 323-ohm lamp are connected in series and placed across a potential difference of 87.1 volts.a. What is the equivalent resistance of the circuit? Include units in your answer b. What is the current through the 217-ohm lamp? Include units in your answer.

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