2.1.3 Resistance

• Resistance is a measure of how much an electrical component or circuit opposes
• Longer components have higher resistance.


  True
• Larger cross-sectional area leads to lower resistance
• What is the relationship between current, voltage, and resistance according to Ohm's Law?

  Directly proportional
• What is resistance measured in?

  Ohms (Ω)
• Which material property affects resistance?

  Resistivity
• What happens to resistance when the length of a conductor increases?

  Resistance increases
• The resistance of a component depends on its material, length, and cross-sectional area.


  True
• In Ohm's Law, the formula for current is I = V/R
• Ohm's Law is fundamental for analyzing electrical circuits.


  True
• Conductors with larger cross-sectional areas have lower resistance
• What is the relationship between material resistivity and resistance?

  Directly proportional
• Ohm's Law states that current is inversely proportional to voltage.

  False
• Resistance is directly proportional to voltage and inversely proportional to current
• What happens to resistance when the length of a conductor is increased?

  Resistance increases
• A larger cross-sectional area allows electrons to move more freely, reducing resistance.

  True
• Conductors with larger cross-sectional areas have lower resistance
• How does a larger cross-sectional area affect resistance?

  Reduces resistance
• What does resistivity (ρ) measure in the formula for resistance?

  Ease of current flow
• Why does a larger cross-sectional area reduce resistance?

  More electrons can flow
• What is the primary purpose of resistors in electrical circuits?

  Limit current flow
• Heating elements use resistance to generate heat
• Resistance is a fundamental property that enables the control, regulation, and measurement of electrical systems.


  True
• Match the factor affecting resistance with its relationship to resistance:

  Material ↔️ Different resistivities affect resistance

  Length ↔️ Longer components have higher resistance

  Cross-sectional Area ↔️ Larger area reduces resistance
• Materials with high resistivity offer higher resistance
• Resistivity is an intrinsic property that determines how easily current can flow through a material
• What is the purpose of voltage dividers in electrical circuits?

  Create different voltage levels
• What is the formula for voltage in Ohm's Law?

  V = IR
• How does high resistivity affect resistance?

  Increases resistance
• Materials with low resistivity offer lower resistance.


  True
• Larger cross-sectional area lowers resistance
• What is the formula for current in Ohm's Law?

  $I =$$\frac{V}{R}$
• The cross-sectional area of a conductor is a factor affecting its resistance.


  True
• High material resistivity leads to higher resistance
• What is the formula for calculating resistance using resistivity, length, and cross-sectional area?

  $R =$$\rho \frac{L}{A}$
• What happens to the resistance of a conductor as its length increases?

  Resistance increases
• The resistivity of a material is an intrinsic property that affects its resistance.

  True
• How does a longer conductor affect resistance?

  Increases resistance
• The formula for resistance is $R =$$\rho \frac{L}{A}$, where resistance is directly proportional to resistivity and length
• Longer components have higher resistance