2.1.4 Ohm's Law

• What is current (I) in a circuit?

  Rate of flow of charge
• Current (I) is measured in Amperes
• Potential difference is the driving force that causes current to flow in a circuit.
• What is potential difference (V) in a circuit?

  Energy transferred per charge
• Potential difference (V) is measured in Volts
• Ohm's Law states that potential difference is directly proportional to current and resistance.
• What is resistance (R) in a circuit?

  Opposition to current flow
• Resistance (R) is measured in Ohms
• Increasing resistance decreases the current in a circuit for a given potential difference.
• What does Ohm's Law state mathematically?

  $V =$$I \times R$
• Ohm's Law shows that potential difference is directly proportional to current
• If the potential difference across a component doubles, the current through it also doubles.
• What happens to current if resistance increases for a fixed potential difference?

  Decreases
• Match the quantity with its unit:

  Potential Difference ↔️ Volt (V)

  Current ↔️ Ampere (A)

  Resistance ↔️ Ohm (Ω)
• What does resistance determine in a circuit?

  Potential difference needed
• Ohm's Law states that the potential difference across a component is directly proportional to the current flowing through it and inversely proportional to the resistance
• Resistance is measured in Ohms.
• Ohm's Law can be expressed mathematically as V = I × R
• What does the symbol 'V' represent in Ohm's Law?

  Potential difference
• Increasing the resistance decreases the current for a given potential difference.
• Match the quantity with its symbol and unit:

  Potential Difference ↔️ V, Volt (V)

  Current ↔️ I, Ampere (A)

  Resistance ↔️ R, Ohm (Ω)
• Ohm's Law can be expressed mathematically as V = I × R
• Increasing the potential difference increases the current for a fixed resistance.
• What is the unit of resistance in Ohm's Law?

  Ohm (Ω)
• Potential difference is the energy transferred per unit of electric charge.
• According to Ohm's Law, what happens to the current if the resistance is increased?

  Decreases
• Increasing the potential difference increases the current for a fixed resistance.
• Resistance opposes the flow of current, while potential difference drives the flow of current
• What is current measured in?

  Amperes (A)
• Potential difference is the energy transferred per unit of electric charge
• What causes current to flow in a circuit?

  Potential difference
• Resistance determines the amount of potential difference required to drive a certain current.
• Ohm's Law states that V = I × R
• Arrange the steps to explain Ohm's Law:

  1️⃣ Define potential difference

  2️⃣ Define current

  3️⃣ Define resistance

  4️⃣ State Ohm's Law mathematically

  5️⃣ Explain the relationship between V, I, and R
• According to Ohm's Law, what happens to the current when the resistance is increased for a fixed potential difference?

  It decreases
• Resistance is the opposition to the flow of electric current
• Ohm's Law states that the potential difference across a component is directly proportional to the current flowing through it.
• Match the quantity with its unit:

  Potential Difference ↔️ Volt (V)

  Current ↔️ Ampere (A)

  Resistance ↔️ Ohm (Ω)
• What happens to the current in a circuit if the potential difference is doubled while the resistance remains constant?

  It doubles
• Ohm's Law states that the potential difference across a component is directly proportional to the current and its resistance