The ammeter your physics instructor uses for in-class demonstrations has internal resistance r = 75.0 Ω and measures a maximum current of 1.50 mA. The same ammeter can be used to measure currents of much greater magnitudes by wiring a shunt resistor of relatively small resistance, Rshunt, in parallel with the ammeter. (a) Sketch the circuit diagram and explain why the shunt resistor connected in parallel with the ammeter allows it to measure larger currents. (b) Calculate the resistance the shunt resistor must have to allow the ammeter to measure a maximum current of 15.0 A.
Ohm's law
Ohm’s law is a prominent concept in physics and electronics. It gives the relation between the current and the voltage. It is used to analyze and construct electrical circuits. Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it.
Path of Least Resistance
In a series of alternate pathways, the direction of least resistance is the actual or metaphorical route that offers the least resistance to forwarding motion by a given individual or body.
The ammeter your physics instructor uses for in-class demonstrations has internal resistance r = 75.0 Ω and measures a maximum current of 1.50 mA. The same ammeter can be used to measure currents of much greater magnitudes by wiring a shunt resistor of relatively small resistance, Rshunt, in parallel with the ammeter.
(a) Sketch the circuit diagram and explain why the shunt resistor connected in parallel with the ammeter allows it to measure larger currents.
(b) Calculate the resistance the shunt resistor must have to allow the ammeter to measure a maximum current of 15.0 A.
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