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- A portable coffee heater supplies a potential difference of 12.0 V across a Nichrome heating element with a resistance of 1.67 Ω. (a). Calculate the power (in W) consumed by the heater. (b) How many minutes would it take to heat 1.43 kg of coffee from 20.6°C to 45.2°C with this heater? Coffee has a specific heat of 4184 J/(kg*C°). Neglect any energy losses to the environment.A portable coffee heater supplies a potential difference of 12.0 V across a Nichrome heating element with a resistance of 1.92 Ω. (a) Calculate the power (in W) consumed by the heater. W (b) How many minutes would it take to heat 1.13 kg of coffee from 20.6°C to 46.2°C with this heater? Coffee has a specific heat of 4184 J (kg · °C) . Neglect any energy losses to the environment. minUsing Kirchhoff's rules, find the following. (₁ = 70.4 V, E₂ = 60.8 V, and 3 = 78.4 V.) 4.00 ΕΩ www R$ IRI = IR2 = IR3 b = a E₁ 9.00 ΕΩ ww R₁ (a) the current (in mA) in each resistor shown in the figure above mA R₂ с mA E₂ mA · 3.00 ΚΩ d E, (b) the potential difference between points c and f (Give the magnitude of your answer in volts and select the point of highest potential.) magnitude of potential difference V point at higher potential ---Select--- (c) What If? If all of the resistors in the circuit were decreased in value by a factor of 1,000, would the current in each resistor simply increase by a factor of 1,000? Explain your answer.
- A battery has an emf of ε = 19 V, an internal resistance r = 28 22, and is connected to a resistor of R = 75 22. Express the current I through the circuit in terms of ε, r and R. Calculate the numerical value of I in A. Express the terminal voltage 4V of the battery in terms of I and R. Calculate the numerical value of 4V in V.Each of the six real batteries in the figure has an emf of 18.6 V and a resistance of 3.89 0. (a) What is the current through the (external) resistance R=3.5102? (b) What is the potential difference across each battery? (c) What is the power of each battery? (d) At what rate does each battery transfer energy to internal thermal energy? (a) Number IM (b) Number i MI (c) Number i IM (d) Number i Units A Units V Units W Units W R > <A professor created the circuit shown in the figure for her lab. Assuming & = 9.00 V and R = 5.10 02, find the following quantities. 12.0 V a E 2.00 Ω ww = www R 4.00 Ω b (a) the current in the 2.00 resistor (Enter the magnitude in mA.) mA (b) the potential difference (in V) between points a and b V₁-V₂² V
- A 527 μF capacitor is discharged through a resistor, whereby its potential difference decreases from its initial value of 83.5 V to 27.7 V in 3.95 s. Find the resistance of the resistor in kilohms.You want to determine the resistance value per meter for a very long wire. In the absence of an ohmmeter, you have at your disposal a battery, a voltmeter and an ammeter. First, you plug the voltmeter into the battery terminals and measure 10.7V. Then you cut a piece of the 20m wire and connect it to the battery, along with the ammeter in series. The reading on the ammeter is 6.00A. Then you cut a 40m piece of wire and connect it in the same way to the battery, with the ammeter in series. The reading is now 3.50A. You may think the voltmeter and ammeter are ideal, but the battery is not. What is the resistance value of 1 meter of wire?A battery with a 0.128 internal resistance supplies 14.2 W of total power with a 8.81 V terminal voltage. Determine the current I (in A) and the power PR (in W) delivered to the load resistor. (Enter your answers to at least three significant figures.) HINT (a) the current I 1.612 XA (b) the power PR 13.86 W
- What is the maximum power deliverable by a stack of 100 10YSZ cells to an optimum resistive load? Given each cell has open circuit voltage of 1.1V in series and the resistance is 17.78 ohms. The dimensions of the 10YSZ electrolyte are 0.1m x 0.1m x .0002m.A 573 µF capacitor is discharged through a resistor, whereby its potential difference decreases from its initial value of 86.1 V to 16.1 V in 3.09 s. Find the resistance of the resistor in kilohms. resistance:A 12.0 V emf automobile battery has a terminal voltage of 16.8 V when being charged by a current of 11.0 A. (a) What is the battery's internal resistance (in N)? 0.4364 (b) What power (in W) is dissipated inside the battery? 52.8 W (c) At what rate (in °C/min) will its temperature increase if its mass is 20.0 kg and it has a specific heat of 0.380 kcal/(kg · °C), assuming no heat escapes? 0.99723 °C/min