•What happens to the brightness of each bulb in a series circuit…..if you add more bulbs?

•The current in a DC series circuit:

•The current in a DC series circuit:

Is the same in all points of the circuit

•If you compare an electrical circuit to a system that carries water, what would the water pipes represent?

•If you compare an electrical circuit to a system that carries water, what would the water pipes represent?

•WIRES

•The ability of an object to resist current is called:

•The ability of an object to resist current is called:

•Electrical resistance

•Objects that conduct electricity poorly are called =

•Objects that conduct electricity poorly are called =

= INSULATORS

•A circuit with a switch turned to the OFF position or a circuit with any break is called:

•A circuit with a switch turned to the OFF position or a circuit with any break is called:

•OPEN CIRCUIT

WHOLE BRAIN TIME-Please turn to your partner and discuss- - The current in DC circuits- - Insulators- - electrical resistance- - wires are like what?

WHAT Type of Circuits ARE THEY?

•The mathematical relationship between current, voltage, and resistance is known as:

•The mathematical relationship between current, voltage, and resistance is known as:

•OHM’s LAW

•What is the current in each resistor in the circuit?

•What is the current in each resistor in the circuit?

WHOLE BRAIN TIME

-- Turn to your partner and discuss

--When do you use that weird formula--Will that weird formula be on the test--How do you find current in a parallel circuit

•A circuit diagram: =

•A circuit diagram: = makes wiring easier =

•A circuit diagram: = makes wiring easier = uses symbols to represent each part of the circuit

=

•A circuit diagram: = makes wiring easier = uses symbols to represent each part of the circuit

= can be interpreted (understood) by anyone familiar with electricity

•A circuit diagram: = makes wiring easier = uses symbols to represent each part of the circuit

= can be interpreted (understood) by anyone familiar with electricity

A closed Circuit is =

A closed Circuit is = = ON

•In many circuit diagrams, any device that uses electrical energy is represented by a:

•In many circuit diagrams, any device that uses electrical energy is represented by a:

•resistor

•A device that uses chemical energy to push current in a circuit is called a =

•A device that uses chemical energy to push current in a circuit is called a =

= A BATTERY

WHOLE BRAIN TIME

-- Turn to your partner and discuss

--What does a battery do--When is a resistor shown--How do you know it is a closed circuit-Talk about a circuit diagram

•Electrical current will pass easily through =

•Electrical current will pass easily through =

= CONDUCTOR

•As Jing toasts her morning waffle in the family toaster, 3.0 amperes of current flows with a voltage of 150 volts across the toaster. The resistance of the toaster is:

•As Jing toasts her morning waffle in the family toaster, 3.0 amperes of current flows with a voltage of 150 volts across the toaster. The resistance of the toaster is:

•As Jing toasts her morning waffle in the family toaster, 3.0 amperes of current flows with a voltage of 150 volts across the toaster. The resistance of the toaster is:

•As Jing toasts her morning waffle in the family toaster, 3.0 amperes of current flows with a voltage of 150 volts across the toaster. The resistance of the toaster is:

•As Jing toasts her morning waffle in the family toaster, 3.0 amperes of current flows with a voltage of 150 volts across the toaster. The resistance of the toaster is:

•As Jing toasts her morning waffle in the family toaster, 3.0 amperes of current flows with a voltage of 150 volts across the toaster. The resistance of the toaster is:

•A stereo receiver is plugged into a 120-volt outlet. If the receiver has a resistance of 360 ohms, how much current does it use?

•A stereo receiver is plugged into a 120-volt outlet. If the receiver has a resistance of 360 ohms, how much current does it use?

•A stereo receiver is plugged into a 120-volt outlet. If the receiver has a resistance of 360 ohms, how much current does it use?

•A stereo receiver is plugged into a 120-volt outlet. If the receiver has a resistance of 360 ohms, how much current does it use?

•A stereo receiver is plugged into a 120-volt outlet. If the receiver has a resistance of 360 ohms, how much current does it use?

•A stereo receiver is plugged into a 120-volt outlet. If the receiver has a resistance of 360 ohms, how much current does it use?

•A stereo receiver is plugged into a 120-volt outlet. If the receiver has a resistance of 360 ohms, how much current does it use?

•What happens to the current in a circuit with fixed voltage if you increase the resistance of the circuit?

•What happens to the current in a circuit with fixed voltage if you increase the resistance of the circuit?

•What happens to the current in a circuit with fixed voltage if you increase the resistance of the circuit?

•A light bulb requires 3 amps to produce light. The resistance of the bulb is 4 ohms. How many batteries do you need if each battery is 1.5 volts?

•A light bulb requires 3 amps to produce light. The resistance of the bulb is 4 ohms. How many batteries do you need if each battery is 1.5 volts?

•A light bulb requires 3 amps to produce light. The resistance of the bulb is 4 ohms. How many batteries do you need if each battery is 1.5 volts?

•A light bulb requires 3 amps to produce light. The resistance of the bulb is 4 ohms. How many batteries do you need if each battery is 1.5 volts?

•A light bulb requires 3 amps to produce light. The resistance of the bulb is 4 ohms. How many batteries do you need if each battery is 1.5 volts?

•A light bulb requires 3 amps to produce light. The resistance of the bulb is 4 ohms. How many batteries do you need if each battery is 1.5 volts?

•A light bulb requires 3 amps to produce light. The resistance of the bulb is 4 ohms. How many batteries do you need if each battery is 1.5 volts?

•A light bulb requires 3 amps to produce light. The resistance of the bulb is 4 ohms. How many batteries do you need if each battery is 1.5 volts?

Total Voltage = Total Resistance =

Total Voltage = 9 V Total Resistance =

Total Voltage = 9 V Total Resistance = 4.5 ohms

Total Voltage = 9 V Total Resistance = 4.5 ohms

Total Voltage = 9 V Total Resistance = 4.5 ohms

Total Voltage = 9 V Total Resistance = 4.5 ohms

Total Voltage = 9 V Total Resistance = 4.5 ohms

Total Voltage = 9 V Total Resistance = 4.5 ohms

Total Voltage = 9 V Total Resistance = 4.5 ohms

What is the voltage drop across each resistor?

What is the voltage drop across each resistor?

What is the voltage drop across each resistor?

What is the voltage drop across each resistor?

What is the voltage drop across each resistor?

So in a series circuit (like the one we just did), what can we say about voltage drops?

So in a series circuit (like the one we just did), what can we say about voltage drops?

If you add all the voltage drops( 4 + 4 + 4) = EQUALS the totalVoltage…..right?

Is current the same though all components of a series circuit?

The current in each resistor is?

The current in each resistor is?

The current in each resistor is?

The current in each resistor is?

•Is the current the same across each of these resistors? Why or Why not?

•Is the current the same across each of these resistors? Why or Why not?

•YES……because…..?

•Is the current the same across each of these resistors? Why or Why not?

•YES……DC circuit

•Is the current the same across each of these resistors? Why or Why not?

•YES……DC circuit

•To calculate butUse Total Resistance