components

• What do we need to know to draw circuit diagrams?

  The functions of components and their symbols
• What is the purpose of a cell or battery in a circuit?

  To provide electric power to the circuit
• How does a switch affect the flow of electricity?

  It can open or close the circuit
• What happens when a switch is open?

  The circuit is incomplete and electricity stops
• What is a filament lamp?

  A small bulb used in circuits
• What is the function of a fuse in a circuit?

  It breaks if too much current flows
• What is a diode's function in a circuit?

  It allows current to flow in one direction
• What is an LED?

  A light-emitting diode that emits light
• Where are LEDs commonly used?

  In alarm clocks, traffic lights, and bulbs
• What does an ammeter measure?

  Current in a circuit
• How is an ammeter connected in a circuit?

  It is connected in series
• What does a voltmeter measure?

  Potential difference in a circuit
• How is a voltmeter connected in a circuit?

  It is connected in parallel
• What are the types of resistors mentioned?

  • Fixed resistors: provide a set resistance
  • Variable resistors: allow modification of resistance
  • Light-dependent resistors (LDRs): resistance changes with light intensity
  • Thermistors: resistance changes with temperature
• What is the function of an LDR?

  Its resistance depends on light intensity
• How does an LDR behave in bright light?

  It has low resistance allowing high current
• What happens to an LDR's resistance in darkness?

  Resistance is high, limiting current flow
• How can LDRs be used in automatic night lights?

  They detect light and adjust current flow
• What is the function of a thermistor?

  Its resistance depends on temperature
• How does a thermistor behave at higher temperatures?

  Resistance decreases, allowing more current
• What happens to a thermistor's resistance at lower temperatures?

  Resistance increases, limiting current flow
• Where can thermistors be used effectively?

  In car engines and electronic thermostats
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