Problem # 3.36 A shunt resistor and a 50mV, 1 mA d’Arsenval movement are used to build a 5A ammeter. A resistance of 20 mΩ is placed across the terminals.

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Presentation transcript:

Problem # 3.36 A shunt resistor and a 50mV, 1 mA d’Arsenval movement are used to build a 5A ammeter. A resistance of 20 mΩ is placed across the terminals of the ammeter. What is the new full-scale range of the ammeter? ECE 201 Circuit Theory 1

Imeasured = 5A Ishunt = 4999 mA ECE 201 Circuit Theory 1

Problem # 3.36 RA =20 mΩ ECE 201 Circuit Theory 1

The meter is modified by placing a 20mΩ resistor in parallel with the existing 0.01Ω resistor. ECE 201 Circuit Theory 1

Ifs 1 mA Ish 6.67 mΩ ECE 201 Circuit Theory 1