Ohm's Law

What size resistor would produce a 3 Amp current flow with a 12 Volt battery

• 1 Ohm
• 3 Ohms
• 4 Ohms
• 12 Ohms

What is the Voltage of a circuit that has a resistance of 5 Ω and a current of 2 A?

• 25 V
• 10 V
• 2.5 V
• 0.4 V

A 3-V battery sends a current of 0.10 A through a light bulb. What is the resistance of the filament of the bulb?

• .033 Ω

• 30 Ω

• .3 Ω

• 300 Ω

______ in a circuit is directly proportional to the electric potential difference

• AMMETER

• CURRENT

• VOLTMETER

• OHM’S LAW

Ohm's law is the relationship between...

• Circuits, switches and resistors

• Voltage, Amps and Circuits

• Amps, Ohms and Volts

• Voltage, Current and Resistance

Which statement fully describes the graph shown.

• As current increases voltage decreases (inversely proportional). This graph does not follow Ohm's law, it is for a non-ohmic component.

• As voltage increases current increases (directly proportional). This graph follows Ohm's law, it is for a non-ohmic component.

• As voltage decreases current increases (inversely proportional). This graph does not follow Ohm's law, it is for an ohmic component.

• As voltage increases current increases (directly proportional). This graph follows Ohm's law, it is for an ohmic component.

This graph is for a filament lamp. What is the reason for the shape of the line shown on the graph?

• Filament lamps are variable resistors. So we can use a sliding scale to change their resistance, which will change the current going through them.

• Filament lamps cool down when current runs through them, their resistance increases causing the current to decrease over time.

• Filament lamps heat up as current runs through them, this increases resistance causing the current to decrease over time.

• Filament lamps heat up as current runs through them, this increases resistance causing the current to increase over time.

Select all that apply. A cooling fan is a...

• Ohmic component

• Non-ohmic component

• Component that allows current to flow in both directions.

• Does obey ohms law.

Which graphs follow Ohm's law?

• Graph B only

• Graph A and C only

• Graph A only

• None of the graphs

Select all of the following that correctly describe what a volt meter measure?

• A volt meter measures the potential difference (or voltage) passing through a circuit element.

• A voltmeter measures the electric current across a circuit element.

• A volt meter measures the potential difference (or voltage) across a circuit element.

• A voltmeter measures the electric current passing through a circuit element.