Unit 2 - Resistance Flashcards
Describe the total resistance when resistors are added in series.
The total resistance is the sum of the individual resistances.
Explain how total resistance in parallel compares to total resistance in series.
Total resistance in parallel is less than total resistance in series.
How does the arrangement of resistors affect current flow in a circuit?
In parallel, the current has multiple paths to take, allowing for a lower total resistance.
Define the function of a multimeter in electrical measurements.
A multimeter can be used as an ammeter, voltmeter, or ohmmeter.
What is the purpose of an ohmmeter?
An ohmmeter measures resistance.
Outline the steps for investigating resistance in a group setting.
Work in groups of 2 or 3, use one size of resistor, complete the worksheet, and write down rules for calculating resistance.
Identify a safety precaution when using a multimeter.
Do not plug in a power supply when using a multimeter.
Describe how to measure resistance using a multimeter.
Connect leads to the two bottom sockets, turn the dial to the Ω sign, and start on the highest value, working your way down.
Define electrical resistance.
Electrical resistance is a measure of how freely current can flow through an electrical component, measured in Ohms (Ω).
How does the thickness of a wire affect resistance?
Resistance is affected by the thickness of a wire; thicker wires generally have lower resistance.
How does the length of a wire influence resistance?
Longer wires typically have higher resistance compared to shorter wires.
Explain the relationship between current and resistance.
As resistance increases, the current flowing through a circuit decreases, assuming voltage remains constant.
What are the key terms associated with resistance?
Key terms include resistance, ohm, resistor, and multimeter.
Describe the objective of investigating resistors in series and parallel.
The objective is to understand how resistors behave when connected in series and parallel configurations.
How would you draw a circuit diagram with two resistors in series?
Include a battery, two resistors connected end-to-end, and voltmeters and ammeters to measure voltage and current.
How would you draw a circuit diagram with two resistors in parallel?
Include a battery, two resistors connected across the same two points, and voltmeters and ammeters to measure voltage and current.
What is the significance of the Ω sign on a multimeter?
The Ω sign indicates that the multimeter is set to measure resistance.
