AKS 10a/10b CIA Review

​AKS 10A/10B Series, Parallel and Ohms

By Marissa Brown

Circuits and Ohm’s Law

• Battery

• Bulb

• Switch

• Resistor

​

​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

Most real circuits happen to be more complex than just open and closed circuits (simple circuits)

• the complex cicuits contain multiple power sources and multiple wire pathways.​

Circuits

• circuits with only 1 path for electrons to travel (just like the simple circuits)

• these are used in devices such as:

  • flashlights

  • lamps

  • refrigerators​

Series Circuits

• Pros

  • each part of the circuit is wired one after the other (so it is very easy to set up) and this allows a constant current to be produced

    • the devices don't overheat easily

Series Circuit Pros/Cons

​

• Voltage, Current, and Resistance

  • The current is the same through every load because there is only a single path for the electricity to flow. 

  • The total resistance is the sum of all the individual resistances. 

  • The total voltage is shared among the components, and the sum of the voltage drops across each component equals the source voltage. 

Series Circuit

​

• Cons

  • when any part of a series circuit is disconnected, the current is not able to flow (it is an open circuit)

Series Circuit Pros/Cons

​

• electricity is cut off from ALL parts of the circuit

• dimming lights (resistance is increasing)

  • you need more batteries to keep the lights in series bright

​​

Open Ended

What would happen in your home if it used a series circuit and you turned off one light?

• These circuits have multiple paths for electrons to travel (unlike the simple circuits)

• these are used in:

  • our homes

  • businesses

  • voltmeters

Parallel Circuits​

• Pros

  • the parts of the circuit are on separate branches

Parallel Circuit Pros/Cons

​

• breaks in the circuit (such as an unscrewed lightbulb or burned out light) will not stop the flow of electricity to the rest of the circuit

• the lightbulbs will have the same brightness with less batteries (because resistance is not decreasing)

  • more paths = less resistance​

• Cons

  • the current is not consistent

    • energy is used up quicker

    • the devices can overheat faster (causing fires because of hot wires)

Parallel Circuit Pros/Cons

​

• Voltage, Current, and Resistance

  • voltage is the same across all components,

  • the total current is the sum of the individual currents through each branch

  • The total resistance of a parallel circuit is always less than the resistance of the smallest individual resistor. 

  • The total current leaving the power source is the sum of the currents flowing through each individual branch. 

Parallel Circuit

​

Multiple Choice

What is a Series Circuit?

• A circuit with more than one path way for current to flow

• A circuit with one path way with one switch.

• An electric circuit with a single path for current to flow.

• Two circuits with one path way for current to flow

Multiple Choice

What is a closed circuit?

• A pathway that allows one circuit to flow

• A pathway that does not allow an electric current to flow.

• A Parallel circuit.

• A pathway that allows an electric current to flow freely - light is on!

Multiple Choice

What is an open circuit?

• A parallel circuit

• A pathway that prevents electric current from flowing freely or stops the flow - light is off!

• A series circuit

• A pathway that allows electric current from flowing freely or stops the flow - light is off!

Multiple Choice

What is an Electric Current

• The pathway through which electric current (electron) flows.

• A Parallel Current

• A series current

• The pathway through which electric current (electron) flows.

Multiple Choice

What is a Conductor?

• A Parallel circuit

• A material that allows heat and electricity to flow through it

• The pathway through which electric current (electron) flows.

• A series current

Multiple Choice

What is an Insulator?

• A material that allows heat and electricity to flow through it

• The pathway through which electric current (electron) flows.

• A pathway that prevents electric current from flowing freely or stops the flow - light is off!

• A material that stops heat and electric current from flowing

Multiple Choice

What is an example of an Insulator?

• Copper wire

• Glass

• Rubber, styrofoam, cotton

• Water

Multiple Choice

What is an example of a Conductor?

• Rubber, styrofoam, cotton

• Wood

• Plastic

• Paperclip, penny, pencil lead

Multiple Choice

What is Voltage?

• The energy available to move charges through a circuit

• A material that allows heat and electricity to flow through it

• A material that stops heat and electric current from flowing

• Rubber, styrofoam, cotton

Multiple Choice

What is Current?

• Rubber, styrofoam, cotton

• The flow of electrons in a circuit

• A material that stops heat and electric current from flowing

• Paperclip, penny, pencil lead

Multiple Choice

What is a Battery?

• Rubber, styrofoam, cotton

• The energy available to move charges through a circuit

• The flow of electrons in a circuit

• The device that provides electrical energy

Multiple Choice

What is a Light Bulb in a circuit?

• The energy available to move charges through a circuit

• The device that provides electrical energy

• Rubber, styrofoam, cotton

• One of the parts of a circuit, when it is in a closed circuit it is lit

Multiple Choice

What is a wire in a circuit?

• One of the parts of a circuit that carries electrons from place to place

• The device that provides electrical energy

• The energy available to move charges through a circuit

• One of the parts of a circuit, when it is in a closed circuit it is lit

Multiple Choice

What is a Switch in a circuit?

• One of the parts of a circuit that carries electrons from place to place

• One of the parts of a circuit that carries electrons from place to place

• The device that provides electrical energy

• The device that opens and closes a circuit

Multiple Choice

What is Parallel Circuit?

• A wire that has a battery and a switch.

• A circuit that contains more than one path for current flow.

• A circuit that contians one path for current flow

• A circuit with a switch