Electricity - Ohm's Law

Ohm's Law states that:

• Current = Voltage x Resistance

• Resistance = Voltage x Current

• Power = Voltage x Current

• Voltage = Current x Resistance

If you decreases the resistance of a circuit, what happens?

• Current decreases
• Current increases
• Electrons disappear
• Bulbs get brighter

If you increase the voltage of a circuit, what happens?

• Current decreases
• Current increases
• Electrons disappear
• Bulbs get dimmer

A device has a resistance of 12Ω and requires 0.5A of current. What voltage is needed to operate the device?

• 24V

• 6V

• 2.4V

• 0.04V

If a circuit contains a light bulb with a resistance of 30Ω and a 6V battery is used, what will the current be?

• 5A

• 180A

• 1.8A

• 0.2A

• Circuit X is brighter than circuit Y
• Circuit Y is brighter than circuit X
• Both circuits have the same brightness
• Neither circuit will light the bulbs

• A₂ = A₃
• A₂ + A₃ = A₁
• A₁ + A₂ = A₃
• A₄ = A₂ - A₃

Tags

NGSS.HS-PS2-5

• all bulbs are lit equally
• the two top bulbs are brighter
• the single lower bulb is brighter
• the single bulb does not light and the other two are dim

A toy has a 3V battery that produces a 0.2A of current. What is the toy's resistance?

• 0.6Ω

• 15Ω

• 0.07Ω

• 6Ω

This circuit has a 24 volt battery and the resistor is 8 ohms. How many amps are running through the circuit?

• 3 Amps
• 192 Amps
• 2 Amps
• 4 Amps