Science, Electricity Flashcards
Resistance / Voltage / Current triangle
/\
/ V \
/ I | R \
Resistance equation
R = V / I
Voltage equation
V = R x I
Current equation
I = V / R
Voltage keywords and symbols
Voltage = V = Volts
Current keywords and symbols
Current = A = Amps
Loops in a series circuit?
One
Loops in a parallel circuit?
More than one
Definition of electricity?
Electricity is the flow of electrically charged particles around a circuit.
What are conductors?
Materials that allow electricity to flow through them
What are insulators?
Materials that do not allow electricity to flow through them
Current in a series circuit?
The current is the same everywhere in a series circuit, even if it has a lot of bulbs or other components
Current in a parallel circuit?
When two components are connected in parallel, the current is shared between the components. The current is shared when it reaches the branches, then adds again where the branches meet.
Voltage in a series circuit?
The supply voltage is shared between components in a series circuit, so the sum of the voltages across all of the components in a series circuit is equal to the supply voltage.
Voltage in a parallel circuit?
The supply voltage is the same with all components in a parallel circuit, so the voltages of all of the components in a parallel circuit is equal to the supply voltage.
What happens if you unscrew a light bulb in a circuit?
This would create a gap in the circuit, meaning it would no longer work.
What happens if you add or deacrese the number of bulbs in a circuit?
If more bulbs are added, the other bulbs would dim. If the number of bulbs were decreased, the other bulbs would brighten.
How do you measure potential difference on a cell?
Put a Voltmeter in parallel to the bulb.
How do you measure current?
Put an ammeter in the main circuit.
If a cell let out 12V and splits into 3 parallel circuits each with 2 bulbs, what would the potential difference of one of the bulbs be?
6V (each parallel circuit has 12V, and that is split between the two bulbs in each circuit).
A circuit measures 3A after the cell. The circuit splits into 3 seperate parallel circuits, each with two bulbs. What would the amps be measured after the second set of bulbs (before the circuits connect again).
Each parellel circuit would have 3 / 3 amps, so 1 amp. That stays the same no matter the number of bulbs.
Describe a bulb symbol
A circle with a cross in it
Describe a wire symbol
a straight line
Describe a ammeter symbol
A circle with an “A” in it
Describe a voltmeter symbol
A circle with a “V” in it
Describe a resistor symbol
A rectangle
Describe a variable resistor symbol
A rectangle with an arrow through it
Describe a cell symbol
A tall vertical line followed by a short vertical line. Connect multiple to create a battery.
Where is the cell on a diagram?
On the top
Where are the bulbs on a diagram?
The bottom
Describe a switch symbol
A diagonal line, not connecting to the wire if open, or a horizontal line connecting the wire if closed.
What is resistance measured in?
Resistance-Ω-Ohms
How many Ωs are 1 kΩ?
1000Ω
How many As are 1 kA?
1000A
How many mAs are 1 A?
1000mA
How many mV are 1 V?
1000mV
