What does the voltmeter read? For the circuit shown in the figure (Figure 1) both meters are idealized, the battery has no appreciable internal resistance, and the ammeter reads 1.70 A. ? V = V Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining Figure 1 of 1 Part B 25.0 N w(A 15.0 2 What is the emf E of the battery? (V) ? 45.0 0 15.0 N 10.0 N E = V 35.0 Ω ε? Submit Request Answer

What does the voltmeter read? For the circuit shown in the figure (Figure 1) both meters are idealized, the battery has no appreciable internal resistance, and the ammeter reads 1.70 A. ? V = V Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining Figure 1 of 1 Part B 25.0 N w(A 15.0 2 What is the emf E of the battery? (V) ? 45.0 0 15.0 N 10.0 N E = V 35.0 Ω ε? Submit Request Answer

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section21.9: Rc Circuits

Problem 21.8QQ: Consider the circuit in Figure 21.29 and assume the batter has no internal resistance. (i) Just...

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Check Your Understanding Digital meters are able to detect smaller currents than analog meters employing galvanometers. How does this explain their ability to measure voltage and current more accurately than analog meters?
Consider the circuit below. The battery has an emf of = 30.00 V and an internal resistance of r = 1,00 . (a) Find the equivalent resistance of the circuit and the current out of the battery. (b) Find the current through each resistor, (c) Find die potential drop across each resistor, (d) Find the power dissipated by each resistor, (e) Find the total power supplied by the batteries.
The power dissipated in a resistor is given by P = V2/R, which means power decreases if resistance increases. Yet this power is also given by P = I2R, which means power increases if resistance increases. Explain why there is no contradiction here.
A 240-kV power transmission line carrying 5.00x102. A is hung from grounded metal towers by ceramic insulators, each having a 1.00x 109- resistance. Figure 21.51. (a) What is the resistance to ground of 100 of these insulators? (b) Calculate the power dissipated by 100 of them, (c) What fraction of the power carried by the line is this? Explicitly show how you follow the steps in the Problem-Solving Strategies for Series and Parallel Resistors.
Refer to Figure 10.17 and the discussion of lights dimming when a heavy appliance comes on. (a) Given the voltage source is 120 V, the wire resistance is 0.800 and the bulb is nominally 75.0 W, what power will the bulb dissipate if a total of 15.0 A passes through the wires when the motor comes on? Assume negligible change in bulb resistance, (b) What power is consumed by the motor?
(a) F ind the voltage drop in an extension cord having a 0.0600-O resistance and through which 5.00 A is flowing. (b) A cheaper cord utilizes thinner wire and has a resistance of 0.300 O. What is the voltage drop in it when 5.00 A flows? (c) Why is the voltage to whatever appliance is being used reduced by this amount? What is the effect on the appliance?
The label on a battery-powered radio recommends the use of a rechargeable nickel-cadmium cell (nicads), although it has a 1.25-V emf, whereas an alkaline cell has a 1.58-V emf. The radio has a 3.20 resistance.(a) Draw a circuit diagram of the radio and its battery. Now, calculate the power delivered to the radio (b) when using a nicad cells, each having an internal resistance of 0.0400 , and (c) when using an alkaline cell, having an internal resistance of 0.200 . (d) Does this differenceseem significant, considering that the radio's effective resistance is lowered when its volume is aimed up?
Show that the power dissipated by the load resistor is maximum when the resistance of the load resistor is equal to the internal resistance of the battery.
Why should you not connect an ammeter directly across a voltage source as shown in Figure 21.48? (Note that script E in the figure stands for emf.)
(a) What advantage does 120-V operation offer over 240 V? (b) What disadvantages does it have?
. The lightbulb used in a computer projector has a resistance of What is the current through the bulb when it is operating on 120 V?
Why do transmission lines operate at very hig1 voltages while household circuits operate at fairly small voltages?