2.1.4 Ohm's Law

• Ohm's Law states that current is directly proportional to voltage
• What is the mathematical formula for Ohm's Law?

  $V =$$IR$
• What is the formula to calculate resistance using Ohm's Law?

  $R =$$\frac{V}{I}$
• Match the variable in Ohm's Law with its corresponding unit:

  Voltage ↔️ Volts (V)

  Current ↔️ Amperes (A)

  Resistance ↔️ Ohms (Ω)
• Which variable does Ohm's Law relate to potential difference?

  Voltage
• What is the SI unit for resistance?

  Ohms
• Match the variable with its description:

  Voltage ↔️ Potential difference, measured in volts

  Current ↔️ Flow of charge, measured in amperes

  Resistance ↔️ Opposition to current, measured in ohms
• Current is measured in amperes.


  True
• Resistance is measured in ohms.


  True
• Voltage is the potential difference across a component.

  True
• The equation I = \frac{V}{R}</latex> is used to solve for current.


  True
• Voltage and current are directly proportional to each other when resistance is constant
• Ohm's Law states that current is directly proportional to voltage when physical conditions remain constant
• The equation $I =$$\frac{V}{R}$ is used to solve for current.


  True
• The flow of electric charge through a component is called current and is measured in
• Match the form of Ohm's Law with the variable it solves for:

  $V =$$IR$ ↔️ Voltage

  $I =$$\frac{V}{R}$ ↔️ Current

  $R =$$\frac{V}{I}$ ↔️ Resistance
• When resistance is constant, voltage and current are directly proportional to each other.
• What is the formula for Ohm's Law?

  $V =$$IR$
• Match the variable with its symbol and units:

  Voltage ↔️ $V$, Volts (V)

  Current ↔️ $I$, Amperes (A)

  Resistance ↔️ $R$, Ohms (Ω)
• If a resistor has a resistance of 5Ω and a current of 3A flows through it, what is the voltage across the resistor?

  $15V$
• A linear relationship between voltage and current implies that resistance is constant.

  True
• For materials obeying Ohm's Law, the resistance remains constant.


  True
• In a resistor with 10Ω resistance, what is the current if the voltage is 20V?

  2A
• The formula for Ohm's Law is V = IR
• What is the proportionality between voltage and current when resistance is constant?

  Direct proportionality
• What does Ohm's Law describe the relationship between?

  Current, voltage, resistance
• Ohm's Law is valid under all physical conditions.

  False
• To find current using Ohm's Law, the formula is I = \frac{V}{R}</latex>
• The unit for voltage is ohms.

  False
• To solve for current in Ohm's Law, the equation is I = \frac{V}{R}</latex>
• Arrange the steps to find current using Ohm's Law:

  1️⃣ Identify the voltage and resistance values

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

  3️⃣ Substitute the values into the formula

  4️⃣ Calculate the current
• Ohm's Law states that the current flowing through a conductor is directly proportional to the potential difference
• The potential difference across a component is measured in volts
• The opposition to the flow of current is called resistance
• Ohm's Law describes the relationship between voltage, current, and resistance
• Match the Ohm's Law equation with what it solves for:

  $V =$$IR$ ↔️ Voltage

  $I =$$\frac{V}{R}$ ↔️ Current

  $R =$$\frac{V}{I}$ ↔️ Resistance
• The equation $R =$$\frac{V}{I}$ is used to solve for resistance.


  True
• The mathematical representation of the proportionality between voltage and current at constant resistance is $V \propto I$.


  True
• The equation $V =$$IR$ is the primary form of Ohm's Law.


  True
• What does Ohm's Law describe the relationship between?

  Voltage, current, and resistance