Understanding Circuit Experiments and Variables

In this video tutorial, Sarah Dix, a physics teacher, guides students through two core practical experiments to investigate resistance. The first experiment explores the relationship between current, potential difference, and resistance using a resistor and a filament lamp. Students learn to set up the circuit, record readings, and plot graphs. The second experiment involves series and parallel circuits with filament lamps, emphasizing the importance of accurate setup and data recording. Throughout, Sarah provides tips for successful experimentation and data analysis.

What is the main objective of the core practical discussed in the video?

• To measure the speed of light

• To investigate resistance

• To study the properties of magnets

• To understand the laws of motion

Which of the following is NOT required for the first experiment?

• Ammeter

• Filament lamp

• Power supply

• Thermometer

What should you do if the ammeter and voltmeter do not show a positive reading?

• Increase the voltage

• Replace the power supply

• Check the connections

• Swap the leads entering and leaving the meter

At what voltage should you start recording readings in the first experiment?

• 2 volts

• 5 volts

• 1 volt

• 3 volts

What is the independent variable in the experiment with the filament lamp?

• Potential difference

• Temperature

• Resistance

• Current

What is the dependent variable in the experiment with the filament lamp?

• Potential difference

• Temperature

• Current

• Resistance

In the second part of the experiment, how many ammeters are required?

• Three

• Two

• One

• Four

What should you do between each set of readings in the series and parallel circuits experiment?

• Increase the voltage

• Switch off the power pack

• Swap the leads

• Replace the filament lamps

What is the purpose of drawing out the circuit on paper before setting it up?

• To avoid using a voltmeter

• To save time

• To ensure correct connections

• To make it look neat

What will your teacher help you with after obtaining all the results?

• Replacing the components

• Increasing the voltage

• Analyzing the data

• Setting up the circuit