Chapter 27: Q50P (page 796)
Question: In Fig. 27-57,, the ammeter resistance is zero, and the battery is ideal. What multiple ofgives the current in the ammeter?
Short Answer
Answer:
The multiple of that gives the current in the ammeter is 0.143.
Chapter 27: Q50P (page 796)
Question: In Fig. 27-57,, the ammeter resistance is zero, and the battery is ideal. What multiple ofgives the current in the ammeter?
Answer:
The multiple of that gives the current in the ammeter is 0.143.
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Get started for freeQuestion: (a) In Fig. 27-4a, show that the rate at which energy is dissipated in Ras thermal energy is a maximum when R =r. (b) Show that this maximum power is .
In Fig. 27-76,. What is the equivalent resistance between points A and B? (Hint: This circuit section might look simpler if you first assume that points A and B are connected to a battery.)
Figure shows a circuit of four resistors that are connected to a larger circuit. The graph below the circuit shows the electric potential V(x) as a function of position xalong the lower branch of the circuit, through resistor 4; the potential VAis 12.0 V. The graph above the circuit shows the electric potential V(x) versus position x along the upper branch of the circuit, through resistors 1, 2, and 3; the potential differences are2.00 V and5.00 V. Resistor 3 has a resistance of 200 Ω. What is the resistance of (a) Resistor 1 and (b) Resistor 2?
(a) In Fig. 27-56, what current does the ammeter read if(ideal battery), , , and ? (b) The ammeter and battery are now interchanged. Show that the ammeter reading is unchanged.
The starting motor of a car is turning too slowly, and the mechanic has to decide whether to replace the motor, the cable, or the battery. The car’s manual says that the12Vbattery should have no more than internal resistance; the motor should have no more than resistance, and the cable no more than resistance. The mechanic turns on the motor and measures 11.4Vacross the battery, a 3.0Vcross the cable, and a current of 50A. Which part is defective?
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