A Nonideal Ammeter. Unlike the idealized ammeter described in Section 25.4, any real ammeter has a nonzero resistance. (a) An ammeter with resistance R A is connected in series with a resistor R and a battery of emf ε and internal resistance r . The current measured by the ammeter is I A . Find the current through the circuit if the ammeter is removed so that the battery and the resistor form a complete circuit. Express your answer in terms of I A , r , R A . and R . The more “ideal" the ammeter, the smaller the difference between this current and the current I A . (b) If R = 3.80 ft, ε = 7.50 V, and r = 0.45 Ω, find the maximum value of the ammeter resistance R A so that I A is within 1.0% of the current in the circuit when the ammeter is absent. (c) Explain why your answer in part (b) represents a maximum value.
A Nonideal Ammeter. Unlike the idealized ammeter described in Section 25.4, any real ammeter has a nonzero resistance. (a) An ammeter with resistance R A is connected in series with a resistor R and a battery of emf ε and internal resistance r . The current measured by the ammeter is I A . Find the current through the circuit if the ammeter is removed so that the battery and the resistor form a complete circuit. Express your answer in terms of I A , r , R A . and R . The more “ideal" the ammeter, the smaller the difference between this current and the current I A . (b) If R = 3.80 ft, ε = 7.50 V, and r = 0.45 Ω, find the maximum value of the ammeter resistance R A so that I A is within 1.0% of the current in the circuit when the ammeter is absent. (c) Explain why your answer in part (b) represents a maximum value.
A Nonideal Ammeter. Unlike the idealized ammeter described in Section 25.4, any real ammeter has a nonzero resistance. (a) An ammeter with resistance RA is connected in series with a resistor R and a battery of emf ε and internal resistance r. The current measured by the ammeter is IA. Find the current through the circuit if the ammeter is removed so that the battery and the resistor form a complete circuit. Express your answer in terms of IA, r, RA. and R. The more “ideal" the ammeter, the smaller the difference between this current and the current IA. (b) If R = 3.80 ft, ε = 7.50 V, and r = 0.45 Ω, find the maximum value of the ammeter resistance RA so that IA is within 1.0% of the current in the circuit when the ammeter is absent. (c) Explain why your answer in part (b) represents a maximum value.
A wire of resistance 5.0 ohm is connected to a battery whose emf is 2.0 V and whose internal resistance is 1.0. In 2.0 min, how much energy is (a) transferred from chemical form in the battery, (b) dissipated as thermal energy in the wire, and (c) dissipated as thermal energy in the battery?
A resistance of 1.5 kilo ohms is connected in series with a 250 microfarad capacitor. If the combined element is suddenly connected across a 240VDC supply, calculate current I after the switch is closed when t = 1 sec, 1.5 sec, 2.0 sec, 2.5 sec, 3.0 sec, 3.5 sec, 4.0 sec, 4.5 sec, 5 sec, 5.5 secs…
a) Show the behavior graphically of charge current i as a Function of time t.b) Interpret the graph
consider a conducting wire made of copper. copper has a carrier density of 8.5x10^28 carriers/m^3 and an electrical resistivity of 1.7x10^-8 ohms*m and a charge of 1e/carrier. If a potential difference of 12V is applied between the ends of a copper wire that is 100m long and 1.0mm in diameter, how much current will flow?
Chapter 25 Solutions
University Physics with Modern Physics (14th Edition)
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