Download test_review_electricity

• 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 total
Voltage…..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 but
Use Total Resistance