P3.3 Circuits

• What is an electrical circuit?

  A closed loop containing a power source
• What does a circuit diagram represent?

  It visually represents electrical circuits
• What is the symbol for a cell in a circuit diagram?

  A simple version of a battery
• How is a battery represented in circuit diagrams?

  Two cell symbols put together
• What is the symbol for a filament lamp?

  A small light bulb symbol
• What happens when a switch in a circuit is closed?

  Current continues flowing around the circuit
• What is current denoted by in electrical circuits?

  The letter i
• How is current measured?

  In amperes, or amps
• What does potential difference represent in a circuit?

  The force driving the flow of electrons
• What is another name for potential difference?

  Voltage
• How is potential difference measured?

  In volts
• What does resistance do in a circuit?

  It opposes the flow of electrons
• How is resistance measured?

  In ohms
• How do electrons flow in a circuit?

  From the negative terminal to the positive terminal
• What does the longer line on a cell symbol represent?

  The positive terminal
• What does the shorter line on a cell symbol represent?

  The negative terminal
• What is conventional current?

  Current flowing from positive to negative terminal
• What are the key terms related to electrical circuits?

  • Potential difference (voltage)
  • Current
  • Resistance
• What are the main components of a simple circuit?

  • Power source (cell or battery)
  • Conductive path (wire)
  • Load (like a filament lamp)
  • Switch (to control current flow)
• What is the relationship between current, potential difference, and resistance?

  • Current (I) is the flow of electrons
  • Potential difference (V) drives the flow
  • Resistance (R) opposes the flow
  • Ohm's Law: $V =$$I \times R$
• A power source for an electric circuit could be a:

  Cell or Battery
• This symbol is used to represent a switch on a circuit diagram.

  
• Current is a measure of the flow of electrons around a circuit
• Amperes, amps, or 'A' are the units of:


  Current
• Potential difference is the force driving the flow of electrons around a circuit
• In 'conventional current', we say that the electrons flow from:


  Positive terminal ➔ negative terminal
• Resistance is everything that resists or opposes the flow of electrons in a circuit
• Voltage, volts, and 'V', are all used to refer to:


  Potential difference
• Ohms (Ω) are the units of:


  Resistance
• What is current?


  Current (I) is a measure of the flow of electrons around a circuit.
• What is potential difference?


  Potential difference (V) is the force driving the flow of electrons around a circuit.
• What is resistance?


  Resistance (R) is everything that resists or opposed the flow of electrons in a circuit.