AKS 10a - Ohms Law

Circuits and Ohm’s Law

• Battery

• Bulb

• Switch

• Resistor

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​Circuit Symbols

Match

Match the following

Battery

Bulb

Switch

Resistor

• Battery

• Bulb

• Switch

• Resistor

• Comes from the battery or another voltage source

• The "push" that moves electrons around the circuit

• Think of it like a water pump - without the pump, the water would just sit in the pipe and not move anywhere

​Voltage (v)

• Electrons in the circuit flowing or moving around the circuit

• Measured in amps

• When electrons move faster, the current is greater

• Like the water flowing through a pipe

Current (I)

• Makes it harder for electrons to flow through the circuit

• Measured in Ohms

• Kind of like friction or sand that slows the water in the pipe down

​Resistance (R)

• Shows the relationship between current, voltage, and resistance

• V is for VOLTAGE (volts)

• I is for CURRENT (amps)

• R is for RESISTANCE (ohms)

Ohm’s Law V=IR

Multiple Choice

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

Multiple Choice

A light circuit is operating at 75 Volts. What is the circuit's current if the resistance is 5 Ohms?

• 375 Amps

• 50 Amps

• 15 Amps

• 0.07 Amps

Example 2

• There are 4 amps of current flowing through a circuit with a 12 volt battery. How much resistance is in the circuit?

Multiple Choice

How many Volts would we need to produce a current of 8 Amps through a 6 Ohm resistor?

• 1.33 volts

• 24 volts

• 0.75

• 48 volts

Multiple Choice

What is the voltage if a resistance of 25 Ω produces a current of 250 amperes

• 6250V

• 10V

• 0.1 V

• 625 V

Multiple Choice

What is the current produced by a voltage of 240 V through a resistance of 0.2 Ω

• 1200 Amps

• 48 amps

• 0.0008 Amps

• 480 Amps

Multiple Choice

The movement of electrons from atom to atom in a line results in a flow of _____. 

• amperage.
• electric current.
• electromagnetic connectors. 

Multiple Choice

As the resistance of a circuit increases, the current will

• increase
• decrease
• stay the same

Multiple Choice

Current has units: 

• kilowatt·hour 
• ampere 
• coulomb 
• volt 

Multiple Choice

What 'flows' in a wire?

• Protons
• Neutrons
• Atoms
• Electrons

Multiple Choice

If the Voltage stays the same and Resistance is increased, Current will 

• Increase

• Decrease

• Stay the same

• X

Multiple Choice

If the Voltage is increased and the resistance stays the same, Current will

• Increase

• Decrease

• Stay the same

• X

Multiple Choice

What is the total amount of voltage?

• 9 v

• 18 ohms

• 10 ohms

• 3 ohms

• 5 ohms

Multiple Choice

What is the total amount of resistance?

• 9 v

• 18 ohms

• 18 volts

• 3 ohms

• 5 ohms

Multiple Choice

The total resistance of this circuit is 

• 25.7 ohms
• 315 ohms
• 324 ohms
• 90 ohms

Multiple Choice

The current going through the 45 ohm resistor is 

• 0.05 amps
• 0.2 amps
• 0.1 amps
• 5 amps

Multiple Choice

What is the Total Resistance in this circuit?

• 3 ohms

• 30 ohms

• 30 amps

• 90 volts

Multiple Choice

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