You are measuring the current in a circuit that is operated on an 18 V battery.

Question

You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed?

Options:

A . 9 V

B . 900 mV

C . 0 V

D . 18 V

Answer: Option A

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