educake sc10

• Where are protons and neutrons located in an atom?

  In the nucleus at the center
• What does it mean for an atom to have the same number of protons and electrons?

  It means the atom has no overall charge
• What is a circuit?

  A closed loop for electrical current
• How can circuit components be connected?

  In series or in parallel
• What happens if one component is removed from a series circuit?

  The circuit does not work anymore
• Why does removing a component from a parallel circuit not affect others?

  Remaining components still form a complete loop
• What is the potential difference across a component?

  Energy transferred by the component
• What does a higher potential difference across a cell indicate?

  More energy transferred to the circuit
• How is potential difference defined?

  Energy transferred per unit charge
• What is the unit of potential difference?

  Volts (V)
• How is a volt defined?

  As a joule per coulomb
• What instrument measures potential difference?

  A voltmeter
• How should a voltmeter be connected?

  In parallel with the component
• What happens to potential difference in a series circuit?

  It is shared among the components
• What is the relationship between the total potential difference and individual components in a series circuit?

  The sum equals the total potential difference
• What must be done when cells are connected in opposite directions?

  Subtract their potential difference
• What happens if there are fewer cells in a circuit?

  The overall potential difference will decrease
• What is electric current?

  The rate of flow of electrical charge
• How does a bigger electric current affect charge flow?

  It means a faster flow of charge
• What is required for electric charge to flow?

  Components that can transfer energy electrically
• What happens if there is a break in the circuit?

  Charge will not flow
• In a closed circuit that is a single loop, what is true about the current?

  The current is the same everywhere
• What causes current in metals?

  The flow of electrons
• How must an ammeter be connected in a circuit?

  In series with the component
• What is the unit of charge?

  Coulombs (C)
• What is the unit of current?

  Amperes or amps (A)
• What is the unit of time?

  Seconds (s)
• How is charge calculated?

  Charge (Q) = current (I) x time (t)
• What happens in a parallel circuit regarding current?

  Current flows through more than one branch
• How is total current in a parallel circuit determined?

  It is the sum of currents through each branch
• What is true about current at a junction in a circuit?

  Total current in equals total current out
• What does resistance measure?

  How difficult it is for current to flow
• What does a higher resistance indicate?

  Harder for current to flow through
• What is the unit of resistance?

  Ohms (Ω)
• What is the equation linking potential difference and current?

  V = I × R
• How is current related to potential difference in a circuit?

  Current is directly proportional to potential difference
• What happens if the potential difference of a cell is doubled?

  The current will also double
• What is the relationship between current and resistance?

  Current is inversely proportional to resistance
• What does a variable resistor do?

  Changes the resistance in the circuit
• How does increasing resistance in a variable resistor affect current?

  It decreases the current in the circuit