Ages 12–13🔬 Science70 verified questions on this shelf

Ohm's Law: voltage, current, resistance

Apply Ohm's Law (V = IR) to calculate current, voltage, or resistance in a simple circuit, and explain that resistance opposes the flow of current

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Question 1 of 3

When a current of 5 A flows through a copper wire of resistance 2 Ω for 10 seconds, which effect of electric current is primarily responsible for the increase in temperature of the wire?

Question 2 of 3

A 12 V cell has an internal resistance of 1 Ω. When the cell is connected to a single external resistor, a current of 2 A flows through the circuit. What is the power dissipated in the external resistor?

Question 3 of 3

A straight wire carrying a steady electric current is placed close to a compass needle. The needle deflects from its original position. This observation best illustrates which effect of electric current?

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