An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (1)
Identify the properties of conductors, insulators, semiconductors, and superconductors.
Evaluate each option based on these properties.
Select the option where X is an insulator and Y is a semiconductor.
The best completion of the chart is X: paper, Y: silicon, so the answer is X : p a p er , Y : s i l i co n .
Explanation
Understanding the Problem We need to complete the chart by identifying the best examples for an insulator (X) and a semiconductor (Y). We will consider the properties of each material type to make the correct selection.
Analyzing Material Properties Let's analyze the properties of each material type:
Conductor: Allows electricity to flow easily (e.g., silver).
Insulator: Resists the flow of electricity (e.g., rubber, paper).
Semiconductor: Has conductivity between a conductor and an insulator (e.g., silicon).
Superconductor: Conducts electricity with no resistance (e.g., mercury).
Evaluating the Options Now, let's evaluate the given options:
Option 1: X: copper, Y: glass
Copper is a conductor, not an insulator.
Glass is an insulator, not a semiconductor.
Option 2: X: rubber, Y: copper
Rubber is an insulator.
Copper is a conductor, not a semiconductor.
Option 3: X: paper, Y: silicon
Paper is an insulator.
Silicon is a semiconductor.
Option 4: X: silicon, Y: glass
Silicon is a semiconductor, not an insulator.
Glass is an insulator, not a semiconductor.
Selecting the Correct Option Based on the analysis, option 3 (X: paper, Y: silicon) correctly identifies an insulator (paper) and a semiconductor (silicon).
Final Answer Therefore, the best completion of the chart is: X: paper Y: silicon
Examples
Understanding the properties of materials like conductors, insulators, and semiconductors is crucial in designing electronic devices. For example, insulators like rubber are used to coat electrical wires to prevent shocks, while semiconductors like silicon are used in computer chips to control the flow of electricity. Choosing the right material for a specific application ensures the device functions safely and efficiently. This knowledge is also applicable in fields like construction, where insulation materials are used to regulate temperature and save energy.
