11.2 Ohm's Law and Resistance

• What does Ohm's Law state regarding the relationship between voltage, current, and resistance?

  V = IR
• Resistance is the opposition to the flow of current in a conductor.


  True
• Ohm's Law implies that current is inversely proportional to resistance
• What is the mathematical expression of Ohm's Law?

  V = IR
• If a 12V battery is connected to a 4Ω resistor, the current flowing through the resistor is 3A
• The unit for voltage is volts.

  True
• What electrical variables are described in Ohm's Law?

  Voltage, Current, Resistance
• If a 12V battery is connected to a 4Ω resistor, the current flowing through the resistor is 3A
• The unit for resistance is ohms.


  True
• Resistance is measured in ohms.


  True
• The mathematical expression of Ohm's Law is V = IR
• Current is the flow of electric charge
• What does resistance oppose in a conductor?

  The flow of current
• The mathematical expression of Ohm's Law is V = IR
• Voltage is directly proportional to current in Ohm's Law.


  True
• What does Ohm's Law state about the relationship between voltage, current, and resistance?

  Voltage is directly proportional to current and resistance
• What is the symbol for resistance in Ohm's Law?

  R
• Voltage is the potential difference across a conductor
• What is the unit of measurement for current?

  Amperes
• The mathematical expression of Ohm's Law is V=IR
• Voltage is directly proportional to both current and resistance
• As resistance increases, current decreases
• Current is measured in amperes
• The symbol for voltage is V
• What is Ohm's Law mathematically expressed as?

  $V =$$IR$
• Resistance is measured in ohms (Ω).

  True
• Ohm's Law states that voltage is equal to the product of current and resistance
• What is resistance measured in?

  Ohms
• As resistance increases, voltage decreases.

  False
• Current is measured in amperes
• What does current represent in an electrical circuit?

  Flow of electric charge
• The unit for current is the ampere (A).


  True
• Current is measured in amperes
• What is the relationship between voltage, current, and resistance according to Ohm's Law?

  V = IR
• Using Ohm's Law, you can calculate any one of the three variables if you know the other two
• Resistance is inversely proportional to current
• When voltage is constant, current and resistance are inversely proportional
• Current is directly proportional to voltage when resistance is constant.


  True
• What is the current flowing through a 4Ω resistor connected to a 12V battery?

  3A
• Ohm's Law can be used to calculate voltage, current, or resistance