Introduction to Ohm's Law

Ohm's Law states that:

• Resistance equals current times voltage

• Voltage equals current times resistance

• Current equals resistance times voltage

• Voltage equals current divided by resistance

Meter that measures current

• Ammeter

• Voltmeter

• Ohmmeter

• Wattmeter

When plotting data in a graph, what type of materials have a constant slope?

• Photo voltaic cells

• Insulators

• Light bulbs

• Ohmic

An ammeter is connected in _________ and the circuit has to be _____

• Series, off

• Series, on

• parallel, off

• parallel, on

A 10 Ohm resistor in a circuit has a potential difference of 5 Volts across it. What is the current through the resistor?

• 1 V

• 0.8 Ohms

• 0.5 A

• 2 A

• 25 Ohms

Why do you think Ohm's Law is one of the most useful laws when we’re working with electric circuits.