P2 Ai Flashcards
What is the purpose of understanding circuit diagrams?
To be able to understand and draw them using the correct symbols.
What symbol represents an open switch in a circuit diagram?
Switch open
What is the symbol for a battery in circuit diagrams?
Battery
What are the components in a circuit?
Parts like bulbs, resistors, etc.
What does the potential difference in an electrical circuit represent?
The ‘driving force’ that pushes charge around the circuit.
What is the unit of electric current?
Amperes, A
What is the unit of electrical charge?
Coulombs, C
What is required for electrical charge to flow in a circuit?
A complete (closed) circuit and a potential difference.
What is resistance in the context of electric circuits?
Anything that slows down the flow of charge.
In a single, closed loop circuit, how does the current behave?
The current is the same everywhere in the circuit.
What is the relationship between charge flow, current, and time?
Charge flow (C) = Current (A) x Time (s) or Q = It.
What is the formula for Ohm’s Law?
V = IR
What is sometimes referred to as ‘voltage’?
Potential difference
If a battery charger passes a current of 2 A for 300 seconds, how much charge is transferred?
600 C
True or False: A closed circuit allows electrical charge to flow.
True
Fill in the blank: Electrical current is a flow of _______.
electrical charge
What is the symbol for a filament lamp in circuit diagrams?
Filament lamp (or bulb)
What is the symbol for a diode in circuit diagrams?
Diode
What is the symbol for an LED in circuit diagrams?
LED
What should you ensure about the wires in a circuit diagram?
All wires should be straight lines.
What is the significance of a closed circuit?
Allows continuous flow of current.
What is the formula that links potential difference, current, and resistance?
V = IR
V is potential difference in volts (V), I is current in amps (A), and R is resistance in ohms (Ω)
What does resistance measure?
How much the current is slowed down
Greater resistance results in smaller current for a given potential difference
What happens to current if the resistance across a component increases?
The current decreases
This is true for a given potential difference across the component