# How the Length Affects the Resistance of a Wire

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How the length affects the resistance of a wire Introduction Aim In this piece of coursework I want to find out how the length affects the resistance of a wire. What is electricity? Electricity is a form of energy. The flow of electrons is the flow of electricity. Every single thing is made up from atoms. In the centre of the atom there is a nucleus. Inside the nucleus there are two different types of particles. • Positively charged particles called protons • Uncharged particles called neutrons. The nucleus of the atom is surrounded by another type of particles. These particles are called electrons. Protons charge is usually equal to the neutrons charge and the amount of protons inside the atom usually is equal to the amount of electrons. An Atom may gain or lose an electron when an outside force aggravates the balancing force between the protons and electrons. (Add in about collisions in a wire look at page 131 in physics textbook) What is Resistance? Electrical resistance is how a material opposes to the flow of electric current (or the flow of electrons) running through it. We measure resistance in Ohms Ω Basically electrical resistance is near enough equivalents to friction that occurs in a mechanical system. You would get an infinite current if you were to apply a voltage to current with zero voltage. All currents will have some resistance which limits the current. Remember this equation: V= I x R Relationship between Resistance, voltage and current. A current always consist of 3 different quantities. Voltage (V) Current (I) Resistance (Ω) These 3 quantities make up Ohms Law. I will be using these in my experiment to measure the resistance of the wire. My Prediction I predict that the longer wires will have bigger resistance. I think this because in a longer wire the electrons will have more collisions