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Skill area P Planning What I am going to investigate is how the diameter of a wire affects the resistance of the wire I plan to change the diameter of the wire In order to keep it a fair test I will need to keep the following things the same -The same voltage of electricity entering the circuit I used 6V -The length of the wire -The temperature -The type of wire I have identified some hazards and I will deal with them as shown below Hazard 1 Electricity What I will do is make sure that the voltage never gets dangerously high to make sure that a nobody is electrocuted and b so that the wire does not get too hot as is may change the results of the experiment or someone could burn themselves When planning my investigation I will be making use of the following scientific knowledge Ohms Law An ohm is a unit used in the international system of measurements to measure resistance Ohms law states that resistance is inversely proportional to the cross-sectional area of the wire The symbol for an ohm is the Greek letter omega By definition an ohm is equal to one volt creating one ampere in a device abbreviated as VA The equation to work out the resistance any circuit is VI R where V is the voltage of a device I is the current and R is the resulting resistance In order to calculate Resistance using Ohms Law I will need to understand the following things Current A measure of the flow of electrons expressed in amperes A Voltage Electric potential or potential difference expressed in volts V It is the push and pull of the potential difference between two points which causes electrical current to flow through a wire or device which is connected across them Resistance Property of a conductor that determines the
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