weak topics!!

• What is current in electrical terms?

  Flow of electrical charge
• What is required for current to flow in a circuit?

  A complete circuit with potential difference
• What happens to current in a single closed loop?

  It has the same value everywhere
• What is the role of potential difference in a circuit?

  It pushes the charge around the circuit
• What does resistance do in a circuit?

  Slows the flow of electrical charge
• What factors affect the current flowing through a component?

  Potential difference and resistance of the component
• What is the formula for charge in a circuit?

  Charge = current × time
• What units are used to measure current, charge, and time?

  Amps, coulombs, and seconds
• What happens to charge flow when a larger current flows?

  More charge passes around the circuit
• What characterizes ohmic conductors?

  They have constant resistance
• How does the resistance of ohmic conductors behave with current?

  It doesn't change with current
• What happens to resistance in a filament lamp as it heats up?

  Resistance increases with temperature
• How do diodes behave with current direction?

  They allow current in one direction only
• What is an LDR?

  A resistor dependent on light intensity
• How does resistance change in an LDR with light intensity?

  Resistance falls in bright light
• What are common applications of LDRs?

  Automatic night lights and burglar detectors
• What is a thermistor?

  A temperature dependent resistor
• How does resistance change in a thermistor with temperature?

  Resistance drops in hot conditions
• What are thermistors used for?

  Useful temperature detectors
• How can LDRs and thermistors be used in circuits?

  • In sensing circuits
  • To turn on or increase power to components
  • Based on environmental conditions
• What characterizes a series circuit?

  Components connected in a line
• What happens if one component is removed from a series circuit?

  The circuit is broken and stops
• How does cell potential difference behave in a series circuit?

  It adds up with more cells
• How is total potential difference shared in a series circuit?

  Shared between various components
• What is the current behavior in a series circuit?

  Same current flows through all components
• How is total resistance calculated in a series circuit?

  Sum of individual resistances
• What characterizes a parallel circuit?

  Components are separately connected to the supply
• What happens if one component is removed from a parallel circuit?

  It barely affects the others
• How does potential difference behave across components in a parallel circuit?

  It is the same across all components
• How is current shared in a parallel circuit?

  Total current equals sum of branch currents
• What happens when a resistor is added in parallel?

  Total resistance decreases
• What are the key differences between series and parallel circuits?

  Series Circuits:

  • Components connected in a line
  • Current is the same everywhere
  • Total resistance is the sum of resistances
  • Removing one component stops the circuit

  
  

  Parallel Circuits:

  • Components separately connected to supply
  • Potential difference is the same across all
  • Current is shared between branches
  • Removing one component barely affects others