# Question: In Exercise 46 suppose instead that the ammeter is connected

In Exercise 46, suppose instead that the ammeter is connected in series with the resistor and that the volt-meter is placed across both the ammeter and the resistor.

(a) Sketch this circuit (with instruments connected) and use it to explain why the correct resistance is not given by R = V/I, where V is the voltmeter reading and I is the ammeter reading.

(b) Show that the actual resistance of the element is smaller than the result in part (a) and is instead given by R = (V/I) – RA, where RA is the resistance of the ammeter.

(c) Show that the result in part (b) reduces to R = V/I for an ideal ammeter.

(a) Sketch this circuit (with instruments connected) and use it to explain why the correct resistance is not given by R = V/I, where V is the voltmeter reading and I is the ammeter reading.

(b) Show that the actual resistance of the element is smaller than the result in part (a) and is instead given by R = (V/I) – RA, where RA is the resistance of the ammeter.

(c) Show that the result in part (b) reduces to R = V/I for an ideal ammeter.

## Relevant Questions

Suppose you are using a drill that is incorrectly wired as in Fig. 18.22a, and you make electrical contact with an ungrounded metal case. (a) Explain why this is a dangerous situation for you. (b) Estimate the current in ...Four resistors are connected in a circuit with a 110-V source, as shown in Fig. 18.41. (a) What is the current in each resistor? (b) How much power is delivered to each resistor? An air-filled parallel plate capacitor consists of square plates 10.0 cm on a side separated by 2.25 mm. (a) What is the capacitance of this arrangement? (b) The capacitor is then connected in series to a 500-Ω resistor ...A charge of 0.250 C moves vertically in a field of 0.500 T that is oriented some angle from the vertical. If the charge’s speed is 2.0 x 102 m/s, what field angle(s) will ensure that the force acting on the charge is 5.0 ...An electron travels at a speed of 2.0 x 104 m/s through a uniform magnetic field whose magnitude is 1.2 x 10-3 T. What is the magnitude of the magnetic force on the electron if its velocity and the magnetic field (a) Are ...Post your question