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- The timing device in an automobile's intermittent wiper system is based on an RC rime constant and utilizes a 0.500F capacitor and a variable resistor. Over whatrange must R be made to vary to achieve time constants from 2.00 to 15.0 s?Check Your Understanding When using Kirchhoff’s laws, you need to decide which loops to use and the direction of current flow through each loop. In analyzing the circuit in Example 10.7, the direction of current flow was chosen to be clockwise, from point a to point b. How would the results change if the direction of the current was chosen to be counterclockwise, from point b to point a?The ignition circuit of an automobile is powered by a 12-V battery. How are we able generate large voltages with this power source?
- When applying Kirchhoff’s loop rule, does the sign (or direction) of a battery’s emf depend on the direction of current through the battery? What about the terminal voltage?Show that the energy that is going through the power supply is 50% decipated through the resistor plus the capacitor.A 15.5 V battery is connected to a 102 Ωresistor.Neglecting the internal resistance of thebattery, calculate the power dissipated in theresistor.Answer in units of W.
- can you use this question to answer the d. power delivered to each resistor?The equation P= V2/R indicates that the power dissipatedin a resistor decreases if the resistance is increased, whereasthe equation P=I2R implies the opposite. Is there acontradiction here? Explain.If C1=C2=C3 =2 μF , calculate the equivalent capacitances of the two circuits shown in thefigure. Are they the same?
- A capacitor bank is designed to discharge 5.00 J of energy through a 10.0-kΩresistor array in under 2.00 ms. To what potential difference must the bank be charged, and what must the capacitance of the bank be?What is the purpose of the resistor connected in series with the galvanometer in a Wheatstone bridge? What would happen if it were initially set to 0 ohms rather than to 500 ohms?A voltage ΔV is applied to a series configuration of n resistors,each of resistance R. The circuit components are reconnectedin a parallel configuration, and voltage ΔV is againapplied. Show that the power consumed by the series configurationis 1/n2 times the power consumed by the parallelconfiguration.