122F10M1_practice

Towards the sphere e the electric

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Unformatted text preview: 16. A certain toaster has a heating element made of nichrome (ρ = 1.5×10 ­6 Ohm meter, α= 4×10 ­4 °C ­1) resistance wire. When it is first connected to the 120 Volt power source, it is at 20°C, and it draws a current of 1.80 Ampere. Once it heats up to operating temperature, it is drawing a current of 1.47 Ampere. What is its temperature then? A. 25 °C B. 540 °C C. 580 °C D. 560 °C E. 600 °C 17. Sept 23. In the circuit shown, what is the current through the 15 Ω resistor? A. 0.29 Amp B. 0.54 Amp C. 0.67 Amp D. 0.40 Amp E. 0.56 Amp 18. Using the directions of currents indicated in the diagram shown, which of the following is a correct statement of one of Kirchhoff’s laws? A. 30 – 25 I1 + 45 I3 = 0 B. 20 – 10 I1 + 35 I2 = 0 C. 10 + 20 I2 – 30 I3 = 0 D. I1 + I3 = I2 E. None of the above, because that is not the correct spelling of his name 19. In this circuit, 0.3 seconds after the switch is closed, the voltage across the capacitor reaches 5 volts. The battery provides 10V, and R = 5Ω. What is the value of C? A. 0.015 Farad B. 0.030 Farad C. 0.060 Farad D. 0.041 Farad E. 0.087 Farad 20. If there is no current flowing through a capacitor, which is correct? A. The voltage could have any constant value. B. The voltage is zero. C. The voltage is changing at a steady rate. D. None of the above....
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