Electricity These flashcards are based on 'electrical charge' (current, conductors and potential difference) in the topic Electricity. 0.0 / 5 ? PhysicsElectricityGCSEAQA Created by: 123Created on: 16-11-20 16:11 What is electrical current? The flow of electrical charges. 1 of 25 What has to be present for an electric charge to flow? A source of potential difference and a closed or complete circuit. 2 of 25 What is electric current measured in? Amps (A) 3 of 25 Does current have the same or different value at any point in a single closed loop? Current has the same value at any point in a single closed loop. 4 of 25 What is the equation that links the flow of charge (C), current (A) and time (S). Flow of charge = current x time 5 of 25 What is the equation for current? (hint rearrange!) Current = Charge / Time 6 of 25 What is an electrical conductor? A material that allows electrical currents to pass through it. 7 of 25 Are metals poor or good electrical conductors? All metals are good electrical conductors. 8 of 25 What are electrical insulators? A material that doesn't allow electrical current to pass through it. 9 of 25 What are examples of good electrical insulators? Plastic and glass. 10 of 25 Do electrical insulators have any free electrons? No they don't. 11 of 25 If they have no free electrons, what does this mean about conducting electricity? Electrical insulators cannot conduct electricity because they have no charges which are free to move and carry a current. 12 of 25 Do electrical conductors have charges which are free to move? Yes they have lots. 13 of 25 Why can metals conduct electricity? Metals have electrons (the charges) that are free to move. The electrical current is caused by the flow of these free electrons. 14 of 25 What is potential difference? The difference in the amount of energy that charge carriers have between two points in a circuit. 15 of 25 What is potential difference (p.d.) measured in? Volts (V) 16 of 25 What is potential difference measured with? A voltmeter. 17 of 25 What's the equation for potential difference? V = I x R Potential difference = Current x Resistance 18 of 25 What is the equation for voltage? V = E ÷ Q Voltage = Energy ÷ Charge 19 of 25 What does an ammeter measure? The flow of current that passes through it. 20 of 25 What type of circuit does an ammeter have to be connected in? A series (the same loop of a circuit). 21 of 25 Where does the electrical component whose current is being measured have to be in relation to the ammeter? It has to be in the same series circuit or same loop of the circuit i.e. next to it. 22 of 25 What do voltmeters measure? The potential difference between two points in a circuit. 23 of 25 What type of circuits must voltmeters be connected in? Parallel (on a separate branch to a circuit) 24 of 25 What is the main difference between measuring current and measuring potential difference? Current is measured through a component where as potential difference is measured between two points either side of a component. 25 of 25
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