IGCSE Edexcel Physics Electricity

IGCSE Edexcel Physics Electricity 1. Define current and state its unit of measurement. - Current is measured in amps (A) and represents the flow of electric charge. 2. What unit is used to measure charge? - Charge is measured in Coulombs (C), representing the amount of electric charge. 3. Describe the unit used to measure energy in electrical systems. - Energy in electrical systems is measured in Joules (J). 4. Define resistance and state its unit. - Resistance is measured in Ohms (Ω) and represents the opposition to the flow of electric current. 5. What unit is used to measure time in electrical calculations? - Time in electrical calculations is measured in seconds (s). 6. Define voltage and state its unit of measurement. - Voltage is measured in Volts (V), representing the electric potential difference between two points. 7. Explain the concept of power and state its unit. - Power is the rate at which energy is transferred or converted and is measured in watts (W). 8. What are the rules governing current in a series circuit? - In a series circuit, the current is the same everywhere. Ammeter readings are consistent throughout. 9. What are the rules regarding voltage in a series circuit? - Voltage is shared among components in a series circuit that are connected in sequence. 10. Describe the general characteristics of a series circuit. - Components in a series circuit are controlled by one switch. Adding more bulbs decreases brightness, and if one bulb breaks, the entire circuit is interrupted. 11. What are the rules governing current in a parallel circuit? - Current splits at each branch equally if the components are identical. 12. How is voltage managed in a parallel circuit? - Voltage across components connected in parallel is the same as the total voltage across each branch. 13. What are the general characteristics of a parallel circuit? - Components in a parallel circuit each have the same voltage across them.Can include a switch to control each branch independently of others If one bulb breaks, others keep working Every branch has the same voltage so brightness stays the same Current/voltage filament shape S shape Resistant of a filament increases as the temperature of the filament increases Reversing the voltage (negative values on graph) reverses the direction of the electric current but not the shape of the curve Does the lamp obey ohms law? No Current voltage graph of a fixed resistor Straight line through the origin