7. Using source transformation, calculate Vm. 62 & V 4 V 12 2 120 2A a) 2v b) -2v c) 1v ) -1v
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A: The given data are: I=10 AV=220 V Here, I, and V denotes the current and voltage.
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- An electric kettle draws 10 A at 220 V for two minutes to heat water. Calculate the energy put into it and hence its gain in mass.How much currenta) flows in a wire 4.80m long if the maximum force on it is 0.725N when placed in a uniform 0.0800T field? b) flows through a device with a resistance of 9.7ohms when connected to a 112V supply? How much charge passes through the device in an hour?15. (3 pts. ) The diagram below represents the variation of the voltage on a capacitor. The current flowing through the capacitor is proportional to the derivative of the voltage on it. Determine and plot as a function of time the derivative of the voltage function illustrated: v(t) 80V t [s] 4 8 10
- 47. A clindrical capacitor of 4 cm length, outer and inner dimaters 2,1 cm respectively. If the capacitor contains mica that has dielectric constant 8.7, and the capacitor is connected to electromotive force device 45 V battery and 1000 N resistor. Then, after an elapsed charging time 5 s when the current at this charging oment is 3 mA, the stored charge and stored energy in the capacitor should be .. and ..respectively. (a) 1.256 nC and 28.279 nJ (b) 6.546 nC and 28.279 nJ (c) 4.573 nC and 32.972 nJ (d) 8.470 nC and 40.234 nJ5. Which of the following, if doubled, would have an effect on the current through a conductor? A. The number density (n) of mobile charge carriers B. The drift speed of the mobile charge carriers C. The charge on the mobile charge carriers D. All of the above3. A 300V voltmeter is specified to be accurate within ±2% at full scale. Calculate the %error when the instrument is used to measure a 120V source?.
- 1) Why do we say the "voltage across" or "the voltage with respect to?" Why can't we just say voltage? a) Voltage is a measure of electric potential difference between two electrical points. b) It's an electrical cliche. c) The other point could be negative or positive. 2) If you plot voltage vs. current in a circuit, and you get a linear line, what is the significance of the slope? a) Power b) Discriminant c) Resistance 3) Which of the following would be the resistance an ideal voltmeter, which could measure a circuit while affecting it the least? a) The same resistance as the battery b) infinity c) The same as the total equivalent resistance of the entire circuit d) zero pls answer all thank you2. Calculate the missing value in each of the following diagrams. a) b) 5V V =? 4Ω |= ? |= 2 A5. What would the voltage be at the following times if the initial voltage is 8V, the resistance is 2 k and the capacitance is 50 uF. You At t=0 ms, V = Ov 8V (b) At t=100 ms, V=_S.SV At t=1000 ms, V= 8V V = Vu (1-22)-> (8)(1-eft) = uv -100 v = (8) 11-e (2000 (50x10²4)) -- S.USTV -1000103 +0₁) = 8.00 V= (8) (1-e 2000 (Saxiy 2 0