Circuit Symbols
What is the symbol for a cell?
*Two parallel lines*
What happens to current if resistance increases?
the current decreases
What is a parallel circuit?
an electrical circuit where components are connected in separate branches, creating multiple paths for current to flow
What tool is used to measure current?
An ammeter
Which electromechanical component, often found in both analog and digital circuits, allows or interrupts the flow of current by altering the continuity of the conducting path, and can exist in configurations such as SPST, SPDT, or DPDT?
A switch
According to Ohm's Law, what is the mathematical formula used to calculate the resistance in a circuit?
R=V / I
How does current behave in a parallel circuit?
the current splits and flows through multiple paths or branches
Describe how to measure voltage in a parallel circuit.
use a voltmeter and connect its probes in parallel across the component you want to measure the voltage drop across
lucky you...
-300
In the context of electronic circuit design, explain the operational role of a variable resistor (also known as a potentiometer or rheostat), including how it influences current and voltage within a circuit...
A variable resistor is an electronic component that allows the user to manually adjust the resistance within a circuit without physically altering the wiring. By changing its internal resistance, it controls the amount of current flowing through a circuit or the voltage across specific components.
Design a complete circuit diagram showing two identical light bulbs connected in parallel to a DC power supply.
Ensure your diagram includes:
A labeled voltage source (e.g., 6V DC)
Switches to control each bulb independently
A voltmeter connected to measure the voltage across one bulb
...
You're given a simple circuit with a battery, a resistor, and a switch. To measure the current flowing through the resistor and the voltage across it:
a) Where should you place an ammeter and why?
b) Where should you place a voltmeter and why?
a) Place the ammeter in series with the resistor to measure the current flowing through it.
b) Place the voltmeter in parallel with the resistor to measure the voltage across it.
What is the purpose of using conventional symbols in diagrams?
simplify and standardize the representation of complex information, making it easily understood by a wide audience
Calculate the resistance if the voltage across a component is 6 volts and the current flowing through it is 0.2 milliamperes.
30,000Ω
Explain why parallel circuits are typically used in residential electrical systems instead of series circuits.
Parallel circuits are used in homes because they allow each device to operate independently. If one light or appliance turns off or fails, the others keep working. Also, each device gets the full voltage, making them run efficiently—unlike series circuits, where voltage is shared and one failure breaks the whole circuit.
What effect does adding more cells have?
Losing ur 400 points
Name 10 components needed to build a complete circuit.
E.g. cell, resister, switch,lamps...
Describe a real-life situation where resistance affects performance.
you're charging your phone with a sketchy old cable that's been twisted, chewed by your dog, or just lived through a decade of trauma. Now, even though the wall adapter says it outputs 5V, your phone charges super slowly. Why? Resistance.
uhmm....
+500
Compare how current and voltage behave in series vs parallel.
In series circuits, current remains constant throughout, while voltage is shared and divides across components