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Variables

Variables. (Electricity). Q1. Jack performed an experiment to find out the relationship between the current that flowed through a lamp and the p.d. (voltage) across it. He changed the potential difference across it (the voltage) in equal steps from 0V to 10V

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Variables

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  1. Variables (Electricity)

  2. Q1. Jack performed an experiment to find out the relationship between the current that flowed through a lamp and the p.d. (voltage) across it. He changed the potential difference across it (the voltage) in equal steps from 0V to 10V (a) What was the dependent variable in his investigation? (b) What was the independent variable in his investigation? (c) What type of variable was the voltage – continuous or discrete?

  3. Q1. Jack performed an experiment to find out the relationship between the current that flowed through a lamp and the p.d. (voltage) across it. He changed the potential difference across it (the voltage) in equal steps from 0V to 10V (a) What was the dependent variable in his investigation? (b) What was the independent variable in his investigation? (c) What type of variable was the voltage – continuous or discrete? Current The potential difference – the voltage You can have any value for the voltage – he just CHOSE whole numbers! Continuous

  4. Q2. William performed an experiment to find out the relationship between the current that flowed through a lamp and the voltage across it. He changed the current in equal steps of 0.25A from 0A to 2.5A (a) What was the dependent variable in his investigation? (b) What was the independent variable in his investigation? (c) What type of graph should he use to display his results?

  5. Q2. William performed an experiment to find out the relationship between the current that flowed through a lamp and the voltage across it. He changed the current in equal steps of 0.25A from 0A to 2.5A (a) What was the dependent variable in his investigation? (b) What was the independent variable in his investigation? (c) What type of graph should he use to display his results? Potential difference - voltage Current A line graph because they are both continuous variables

  6. Q3 James decided to investigate which metal was the best conductor. He put a fixed voltage across wires of 10 different materials and measured the current that passed through them. To make it a fair test he made sure the diameter and length of each of the wires was the same. (a) What was the independent variable in his investigation? (b) What was the dependent variable in his investigation? • Name the control variables. • What type of graph should he use to display his results? • What type of variable is the independent variable – categoric or continuous? • What type of variable is the dependent variable – categoric or continuous?

  7. Q3 James decided to investigate which metal was the best conductor. He put a fixed voltage across wires of 10 different materials and measured the current that passed through them. To make it a fair test he made sure the diameter and length of each of the wires was the same. (a) What was the independent variable in his investigation? (b) What was the dependent variable in his investigation? • Name the control variables. • What type of graph should he use to display his results? • What type of variable is the independent variable – categoric or continuous? • What type of variable is the dependent variable – categoric or continuous? The material Current Voltage, length and diameter of conductor Bar chart Categoric Continuous

  8. Remember YOU pick the independent variable and change it by a regular amount. • The variable that changes because of this is the dependent one!

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