Kirchhoff's Second Law

• Resources Structure
• Key Stage 4
• Physics
• X. Direct current
• 53. Direct current circuit

• Exam Specifications
• Key Stage 4
• AQA GCSE Science A (4461) Physics
• I. Physics 1a Energy and Electricity
• 3. Why are electrical devices so useful?
• to compare and contrast the particular advantages and disadvantages of using different electrical devices for a particular application
• to calculate the amount of energy transferred from the mains using: energy transferred = power × time (kilowatt-hour, kWh) = (kilowatt, kW) × (hour, h)
• to calculate the cost of energy transferred from the mains using: total cost = number of kilowatt-hours cost per kilowatt-hour
• Examples of energy transformations that everyday electrical devices are designed to bring about.
• Examples of everyday electrical devices designed to bring about particular energy transformations.
• The amount of electrical energy a device transforms depends on how long the appliance is switched on and the rate at which the device transforms energy.
• The power of an appliance is measured in watts (W) or kilowatts (kW).
• Energy is normally measured in joules (J).
• Electricity is transferred from power station to consumers along the National Grid.
• The uses of step-up and step-down transformers in the National Grid.
• AQA GCSE Physics (4451)
• V. Physics 2
• 22. What does the current through an electrical circuit depend on?
• to apply the principles of basic electrical circuits to practical situations.
• The resistance of a component can be found by measuring the current through, and potential difference across, the component.
• For components connected in series: − the total resistance is the sum of the resistance of each component − there is the same current through each component − the total potential difference of the supply is shared between the components.
• For components connected in parallel: − the potential difference across each component is the same − the total current through the whole circuit is the sum of the currents through the separate components.
• 23. What is mains electricity and how can it be used safely?
• Cells and batteries supply current which always passes in the same direction. This is called direct current (d.c.).
• AQA GCSE Physics (4451)
• I. Physics 2
• 7. What is mains electricity and how can it be used safely?
• Cells and batteries supply current which always passes in the same direction. This is called direct current (d.c.).
• 6. What does the current through an electrical circuit depend on?
• For components connected in parallel: - the potential difference across each component is the same - the total current through the whole circuit is the sum of the currents through the separate components.
• to apply the principles of basic electrical circuits to practical situations.
• The resistance of a component can be found by measuring the current through, and potential difference across, the component.
• For components connected in series: - the total resistance is the sum of the resistance of each component - there is the same current through each component - the total potential difference of the supply is shared between the components.

resistance, law, battery, electric, current, conductor, second, parallel, junction, circuit, ammeter, resistor, Kirchhoff, kirchhoff's, Electric current, electric circuit, parallel circuit, kirchhoff's second law