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What is the resistance?

1. An ammeter registers 2.5 A of current in a wire that is connected to a 9.0 V battery. What is the wire's resistance?
2. A small electronic device is rated at 0.25 W when connected to 120 V. What is the resistance of this device?

Solution Preview

Current (I) = 2.5 A
Potential difference (V) = 9.0 V

Resistance (R) = ...

Solution Summary

Ohm's law: V = I*R