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R=ρL/AD. It can easily flow from one atom to another by applying a voltage. Made by expert teachers. Our tips from experts and exam survivors will help you through. Electric current originates from which part of an atom? With multiple-choice questions like this, be careful to tick the correct number of boxes – in this case, just one. Explanation: energy source, wires, and switch are the basic components. Calculate the number of electrons that flows through any section of the … Define electrical energy. A laboratory technician wants to make a resistor of value 64 Ω, using some resistance wire. Tick onebox. 9. A. A 430 resistor, a 210 resistor, and a 100 resistor are all in parallel. This is all about MCQs on current electricity for subject Physics. Which of the following is not a type of energy source? Electrical forces are produced by electrical charges.C. This is a section 2 of MCQs on current electricity (Physics) with solutions. A. Use the equation below: You must show how you work out your answer. None of the above, Resistance ‘R’ of a wire of length “L” is given by the relation R=ρL/A. If a 24 V and a 10 V battery are series opposing, the total voltage is, 24. 3. Explanation: When resistance decreases, the current increases. Explanation: In an atom, the free electrons are present at outermost orbit. negatively charged electrons, Electric current originates from negatively charged electrons. According to Ohm’s law, if voltage increases and resistance stays the same: SO if resistance constant, AND if voltage increases Then current also increases because proportional to each other. The total resistance is 12 k. The value of the third resistor. What are the different parts of a rheostat? C. An electric field moving through a conductor, Explanation: to produce a sustained electric current A source of energy, A voltage source. inductorD. 20. None of the above, The rate of flow of an electric charge is known as electric current, A. Infinite resistanceB. The ratio of voltage and electrical current in a closed circuit: Explanation: The ratio of voltage and electrical current in a closed circuit Remains constant, Explanation: The curve representing Ohms law is a Linear. Summary notes, revision videos and past exam questions by topic for AQA Physics GCSE Topic 1 - Energy Like charges attract, unlike charges repel. What is one of the reasons for building wind turbines a few miles out to sea? Give the name of components which is designed to oppose the flow of current. What is the most commonly used conductor in electronics? Revision Questions for Electricity (See also Mains Electricity). Electrical forces are weaker than gravitational forces. These Current Electricity Multiple Choice Questions will be useful for engineering students, faculty members and other professionals. Like charges attract, unlike charges repel.B. R=L/AC. AQA GCSE Physics exam revision with questions & model answers for Series & Parallel Circuits. What are the basic components of a simple electric circuit? Stuck on a tricky physics problem? Physics Topic By Topic Questions and Answers for All Topics in Form 1, Form 2, Form 3 and Form 4 for Kenya Secondary Schools in preparation for KCSE . The amount of work done in joules, when one unit electric charge moves from one point to another point in an electric circuit is called : Explanation: The amount of work done in joules, when one unit electric charge moves from one point to another point in an electric circuit is called potential difference. Some questions in the exam will require you to recall and apply equations you have learned in class. [1 mark] 1. Physics Topic By Topic Questions and Answers for All Topics in Form 1, Form 2, Form 3 and Form 4 for Kenya Secondary Schools in preparation for KCSE . An electrical energy is the energy of moving electrons. “Generator = Mechanical Energy to Electrical Energy. The best way to remember the information in this chapter is to get a pen and paper and write down your answers before clicking on the Answer link which will take you to the correct page.. You may have to read through some of the page before you find the answer. Explanation: volts = current times resistance, 10. He connects up the circuit1 shown. He takes 10 m of this wire. The energy transferred to the power lines is 5000 J each second. armatureD. The instrument used for measuring an electric current is : The instrument used for measuring electric current is ammeter. A. only wiperB. When one of three series resistors is removed from a circuit and the circuit is reconnected, the current. If an equation is given then use it, it’s not a trick. as AC. Understanding how to approach exam questions helps to boost exam performance. The resistance of the wire varies inversely as: Explanation: The resistance of the wire varies inversely as Area of cross section, Explanation: Voltage is a form of Potential energy. 25. In a conductor electrons are flowing from B to A. 16. Make sure you read the question carefully so you understand what you are being asked to do. Made by expert teachers. The wind speed is constant over the sea. Ohm’s law states which relationship between electrical quantities? Resistance is a measure of a material’s opposition to, Explanation: Resistance is a measure of a material’s opposition to current, 11.

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