2.13 know and use the relationship Questions in Edexcel International Adaptability Personal and social between voltage, current and GCSE Physics Revision Guide: Personal and social responsibility Class practical: resistance: Pages 30 to 32 and Pages 96 to responsibility Plot voltage-current 97 voltage = current × resistance characteristic graphs for a V = I × R wire, a resistor, a light bulb and a diode. Note that the gradient is equal to the 2.14 know that current is the rate of resistance only for the wire. flow of charge For the other three, the (requires JAVA) gradient only tells you that 2.15 know and use the relationship the resistance is changing. between charge, current and time: Video clip: charge = current × time (a) Demonstration: Q = I × t Use a camera flash to show how a relatively small 2.16 know that electric current in charge produces a large metallic conductors is a flow of current when discharged in negatively charged electrons a short length of time. 2.17 understand why current is conserved at a junction in a circuit 2.18 know that the voltage across two components connected in parallel is the same 2.19 calculate the currents, voltages and resistances of two resistive components connected in a series circuit
2.13 know and use the relationship between voltage, current and resistance: voltage = current × resistance V = I × R 2.14 know that current is the rate of flow of charge 2.15 know and use the relationship between charge, current and time: charge = current × time Q = I × t 2.16 know that electric current in metallic conductors is a flow of negatively charged electrons 2.17 understand why current is conserved at a junction in a circuit 2.18 know that the voltage across two components connected in parallel is the same 2.19 calculate the currents, voltages and resistances of two resistive components connected in a series circuit Class practical: Plot voltage-current characteristic graphs for a wire, a resistor, a light bulb and a diode. Note that the gradient is equal to the resistance only for the wire. For the other three, the gradient only tells you that the resistance is changing. Demonstration: Use a camera flash to show how a relatively small charge produces a large current when discharged in a short length of time. Questions in Edexcel International GCSE Physics Revision Guide: Pages 30 to 32 and Pages 96 to 97 (requires JAVA) Video clip: (a) Adaptability Personal and social responsibility Personal and social responsibility