4.1.2 Electric Current

• Electric current is the flow of electric charge
• Voltage is measured in volts
• What unit is used to measure current?

  Amperes (A)
• Why must an ammeter be connected in series?

  To ensure all current flows
• In a metal wire, electrons flow from negative to positive when voltage is applied.


  True
• What is the unit of voltage?

  Volts (V)
• Conventional current direction assumes current flows from positive to negative.
• Why is conventional current direction still used in circuit analysis?

  Historical convention
• The heating effect of current is used in electric heaters
• What is the definition of voltage?

  Electric potential difference
• Steps to measure current in a circuit

  1️⃣ Connect the ammeter in series

  2️⃣ Ensure all current flows through the meter

  3️⃣ Read the current value in amperes
• Accurate current measurements are essential for reliable circuit analysis.


  True
• Electric current is measured in amperes
• Voltage is the potential difference that drives electric current
• How is voltage measured in a circuit?

  In parallel with a voltmeter
• Match the direction of flow with the correct term:

  Conventional current ↔️ Positive to negative

  Electron flow ↔️ Negative to positive
• What are three effects of electric current?

  Heating, magnetic fields, chemical changes
• What chemical change occurs during the electrolysis of water?

  Water is split into hydrogen and oxygen
• The unit of electric current is the ampere
• Conventional current direction assumes current flows from positive to negative.

  True
• To measure current, an ammeter must be connected in series
• What is electric current defined as?

  Flow of electric charge
• Match the feature with its corresponding term:

  Current ↔️ Flow of electric charge

  Voltage ↔️ Potential difference

  Unit of current ↔️ Amperes

  Unit of voltage ↔️ Volts
• Voltage exists across two points in a circuit.

  True
• Electrons flow from the negative to the positive terminal in a circuit.

  True
• An ammeter measures current in amperes.


  True
• A current-carrying conductor produces a magnetic field around it.

  True