Electricity part one - Q&A 0.0 / 5 PhysicsElectricityGCSEAQA Created by: Cat91Created on: 17-06-18 07:44 What does the current in a circuit depend on? Resistance and potential difference. 1 of 25 Potential difference = Current x resistance. (V=IR) 2 of 25 What is P.D measured in? Volts (V) 3 of 25 What is current measured in? Amperes (A) 4 of 25 What is resistance measured in? Ohms 5 of 25 What is current a measure of? The rate of flow. 6 of 25 What happens if there's a larger current? A faster rate of flow. 7 of 25 Which elements of a circuit resist current? All of them. 8 of 25 What is a variable resistor? A resistance that can be changed. 9 of 25 What is a fixed resistor? A resistance that stays the same. 10 of 25 What is a resistor? Something designed to reduce the current. 11 of 25 What are resistors used for? To control the current in electric circuits. 12 of 25 What is resistance a measure of? The amount of opposition to the current. 13 of 25 Who discovered the connection between current, voltage and resistance and when was it made? Georg Ohm in 1827. 14 of 25 What is V=IR known as? Ohms Law 15 of 25 If the p.d increases, what also increases? The current. 16 of 25 What are the p.d and the current? Directly proportional. 17 of 25 What are the current and the resistance? Inversely proportional. 18 of 25 Name some factors that affect the resistance of a wire. Material, thickness, length and temp. 19 of 25 How does the length of a wire affect it's resistance? The longer the wire, the higher the resistance. 20 of 25 What causes resistance? Electrons colliding with metal ions. 21 of 25 What does thickness have to do with resistance? The thicker the wire the larger the surface area the less of a chance of collision. 22 of 25 What are the two different types of circuit? Series and parallel. 23 of 25 What happens when there's multiple resistors in parallel? The total resistance of the circuit is reduced. 24 of 25 What happens when there's multiple resistors in series? The total resistance of the circuit is increased. 25 of 25

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