11.2 Ohm's Law and Resistance

• Ohm's Law states that the voltage across a conductor is directly proportional to the current flowing through it.


  True
• If a circuit has a 12V battery and a resistance of 6 ohms, what is the current flowing through it?

  2A
• Ohm's Law is a fundamental principle for analyzing and designing electrical circuits.

  True
• How does Ohm's Law relate voltage, current, and resistance?

  $V =$$IR$
• Match the factor affecting resistance with its effect:

  Material ↔️ Different resistance levels

  Length ↔️ Increases resistance
• What does resistance measure in a material?

  Opposition to current flow
• The resistivity of a material indicates its inherent ability to resist current flow
• What are the three fundamental components in electrical circuits according to Ohm's Law?

  Voltage, current, resistance
• What is the current flowing through a 6Ω resistor connected to a 12V battery?

  2A
• What is the mathematical formula for Ohm's Law?

  V = IR</latex>
• Match the variable in Ohm's Law with its unit:

  Voltage ↔️ Volts (V)

  Current ↔️ Amperes (A)

  Resistance ↔️ Ohms (Ω)
• Resistance is the opposition to current flow in a circuit.

  True
• Ohm's Law states that voltage is directly proportional to resistance.

  False
• Resistance increases proportionally with the length of the material
• The formula for calculating resistance using resistivity is $R =$$\frac{\rho L}{A}$
• What does Ohm's Law describe in electrical circuits?

  Voltage, current, and resistance
• Match the electrical term with its symbol and unit:

  Voltage ↔️ V, Volts

  Current ↔️ I, Amperes

  Resistance ↔️ R, Ohms
• Steps to solve for current using Ohm's Law if given voltage and resistance:

  1️⃣ Identify voltage (V) and resistance (R)

  2️⃣ Apply the formula $I =$$\frac{V}{R}$

  3️⃣ Calculate the current (I)
• The unit of current in Ohm's Law is amperes
• Resistance is measured in ohms.


  True
• The resistance of a conductor increases proportionally with its length
• What is the formula for calculating resistance using resistivity, length, and area?

  R = \rho \frac{L}{A}</latex>
• The resistance of a conductor increases proportionally with its length.


  True
• Match the electrical quantity with its formula:

  Voltage ↔️ $V =$$IR$

  Current ↔️ $I =$$\frac{V}{R}$

  Resistance ↔️ $R =$$\frac{V}{I}$
• Ohm's Law can be rearranged to solve for current as $I =$$\frac{V}{R}$, where current is measured in amperes
• The formula to solve for current in Ohm's Law is $I =$$\frac{V}{R}$, where resistance is measured in ohms
• What are the three variables in Ohm's Law?

  Voltage, current, resistance
• Voltage is measured in volts
• If a 6V battery is connected to a 2Ω resistor, the current is 3A
• What is resistance a measure of?

  Opposition to current flow
• What is resistivity (ρ) a measure of?

  Inherent resistance ability
• Voltage is directly proportional to current in a circuit.


  True
• Ohm's Law can be used to calculate voltage, current, or resistance if the other two variables are known.


  True
• What is the formula for calculating current using Ohm's Law?

  $I =$$\frac{V}{R}$
• Match the scenarios with the correct calculations using Ohm's Law:

  Find voltage with I = 2A, R = 4Ω ↔️ $V =$$2A \times 4Ω =$$8V$

  Determine current with V = 12V, R = 6Ω ↔️ $I =$$\frac{12V}{6Ω} =$$2A$

  Calculate resistance with V = 9V, I = 3A ↔️ $R =$$\frac{9V}{3A} =$$3Ω$
• The mathematical expression for Ohm's Law is V = IR
• Using Ohm's Law, if we know the voltage and current, we can solve for resistance
• What is the unit of voltage in Ohm's Law?

  Volts
• What does resistance measure in a circuit?

  Opposition to current flow
• The resistivity of a material indicates its ability to resist current flow.


  True