4. Derive the power dissipated in a resistor when then there is a voltage across it, V, and a current through it, I.
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- 4. In the following circuit R, = 62 IT %3D A I, I2 12v RA = 120 R4 = 120 B (1) Find the equivalent resistance for the two parallel resistor Ra and R, (2) Find the equivalent resistance ( total resistance) for R, R, and R, (3) Calculate the current, I, , flowing from point A and back to B (4) Find the voltage drop across R, (5) Find the voltage drop across R4 (6) Calculate the I, (7) Calculate the l, (8) Is sum of I, and I, equal to l, ? (9) Calculate the power dissipated on R, (10)Calculate power dissipated on RA (11)Calculate the power dissipated on R, (12) Find the total power dissipated from R, RA, and R, (13) If R, RA, and R, are connected in series, find the total power dissipated from R RA, and R. (14)From the answer in (12) and answer from (13), which answer is larger? А,18)4. In an ECG, if the potential between the Right and left arm leads is 0.8 mV, and the potential between left leg/left foot and left arm leads is 1.2 mV, what is the potential between right arm and left leg/left foot in mV?
- 9. The following question is about power dissipation in a resistor, which we didnâÂÂt really cover in class. This topic is fairly easy though. In a circuit, all the power delivered by the battery must be dissipated by the elements to the circuit. This is simply a statement of the conservation of energy. How much energy dis- sipated depends on the resistance of the element and the voltage across the resistor, or the current through it. The relevant equa- tions for the problems are as follows. For a circuit element, the power dissipated (or generated) is P = IV, where V and I are the voltage across and current through a circuit element. We know that a resistor obeys OhmâÂÂs Law V = IR, which means that for a resistor, the power dissipated is P = 1²R=V²/R. Consider the following two circuits with identical batteries and re- sistors. А В C R R R RS R If the power dissipated by the resistor in circuit A is P, what is the power dissipated by one resistor in circuit B? If the power…#2 - For the previous problem, if the motor turns on when the voltage across it is 80% of the battery voltage, what is the ratio of the capacitor's charging time to its discharge time? 7.2 CORRECT R Vc Vo Motor 1.6 PC C 0.22 PC