to allow a current in one circuit to operate a switch in another circuit to protect a circuit by melting if the current becomes too large
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1 1 What is the function of a relay? to allow a current in one circuit to operate a switch in another circuit to prevent an electric shock by earthing a metal case to protect a circuit by melting if the current becomes too large to transform a d.c. voltage to a different value 2 domestic circuit includes a 30 fuse. This protects the wiring if there is too much current in the circuit. In which wire is the 30 fuse positioned, and what does it do when it operates? position wire wire wire wire operation disconnects the circuit reduces the current to 30 disconnects the circuit reduces the current to 30 3 fter some building work in a house, a bare (uninsulated) wire is left protruding from a wall. What is the greatest hazard? a fire a fuse blows an electric shock no current flows PhysicsndMathsTutor.com
2 4 circuit-breaker is designed to protect a circuit which usually carries a current of 2. The time taken to break the circuit depends on the current, as shown in the graph. time taken to break the circuit / s current / What happens when the current in the circuit is 2 and what happens when the current is 18? when the current is 2 when the current is 18 5 The diagram shows a 10 Ω resistor and a 20 Ω resistor connected in a potential divider circuit. 10 Ω 12.0 V 20 Ω V What is the reading on the voltmeter? 4.0 V 6.0 V 8.0 V 12.0 V PhysicsndMathsTutor.com
3 6 In the circuit shown, only one of the fuses has blown, but none of the lamps is lit. Which fuse has blown? power supply PhysicsndMathsTutor.com
4 7 In an electrical circuit, what is the purpose of a fuse? to connect the metal case of an to the earth to cut off the electrical supply if the current is too large to keep an electrical dry in damp conditions to maintain a steady voltage as the current varies 8 fuse is used to protect an electric circuit. Which diagram shows where the fuse should be connected? PhysicsndMathsTutor.com
5 9 Either a fuse or a circuit-breaker can be used to protect electrical cables from large currents that could cause overheating. X cable electrical supply Y cable When a fuse is used, where should it be connected, and when a circuit-breaker is used, where should it be connected? position of fuse position of circuit-breaker X X X Y Y X Y Y 10 n is connected to a mains supply. Its circuit also contains a switch and a fuse. Which circuit shows the fuse in the correct position? PhysicsndMathsTutor.com
6 11 In the circuit shown, the current from the battery divides equally between the two lamps. Each ammeter reads 6.0. What is a suitable rating for the fuse in this circuit? n is connected to a mains supply. Its circuit also contains a switch and a fuse. Which circuit shows the fuse in the correct position? PhysicsndMathsTutor.com
7 13 The current in a kettle is 10 and it is protected by a 13 fuse. The owner of the kettle replaces the 13 fuse with a 3 fuse. What happens when the kettle is switched on? The fuse blows and the kettle is damaged. The fuse blows and the kettle is undamaged. The fuse does not blow and the kettle works correctly. The fuse does not blow but the kettle fails to work. 14 In an experiment to measure the speed of sound, a student uses a stopwatch to find the time taken for a sound wave to travel from X to Y. She does this six times. sound travels from X to Y X Y The table shows her results. measurement / s first 0.5 second 0.7 third 0.6 fourth 0.4 fifth 0.9 sixth 0.5 Which value for the time should be used to calculate the speed of sound? 0.4 s 0.5 s 0.6 s 0.9 s PhysicsndMathsTutor.com
8 15 desk lamp should have a 3 fuse fitted, but a 13 fuse has been fitted by mistake. The lamp is not faulty. The lamp is switched on. What happens? The fuse blows. The fuse does not blow but the lamp does not light. The lamp draws too much current and the supply cables could melt. The lamp works normally. 16 Each branch of a domestic circuit often includes a circuit-breaker. This protects the wiring if too much current flows in the circuit. In which wire is the circuit-breaker placed and what does it do when it operates? circuit-breaker in wire wire wire wire when the circuit-breaker operates it disconnects the circuit reduces the current to a safe value (not zero) disconnects the circuit reduces the current to a safe value (not zero) PhysicsndMathsTutor.com
9 17 The diagram shows the connections to an electric heater. Three fuses have been added to the circuit. fuse 1 heating element plastic case fuse 2 fuse 3 heater Which of the fuses are correctly placed? fuse 1, fuse 2 and fuse 3 fuse 1 and fuse 2 only fuse 1 only fuse 2 only 18 n electric motor is connected to the mains supply by insulated wires. The circuit is protected by a fuse, but the connecting wires become hot. insulated connecting wire M motor insulated connecting wire How could the wires be prevented from becoming so hot? onnect a second fuse in the wire. Use a fuse with a higher current rating. Use thicker connecting wires. Use thicker insulation on the connecting wires. PhysicsndMathsTutor.com
10 19 circuit-breaker is designed to protect a circuit which usually carries a current of 2. The time taken to break the circuit depends on the current, as shown in the graph. time taken to break the circuit / s current / What happens when the current in the circuit is 2 and what happens when the current 18? when the current is 2 when the current is n air conditioner and a television are both connected to the same electrical circuit. X power supply air conditioner television The current in the air conditioner is 4.0 and the current in the television is 6.0. Several different fuses are available. Which fuse should be connected at X? PhysicsndMathsTutor.com
11 21 In this circuit, a component at X automatically protects the wiring from overheating if there is a fault. X electrical supply Which components are suitable to use at X? a circuit-breaker, a fuse or a switch only a circuit-breaker or a fuse only a circuit-breaker or a switch only a fuse 22 Which circuit includes a capacitor and what does the capacitor do in this circuit? circuit potential divider potential divider time delay time delay what the capacitor does stores current stores energy stores current stores energy 23 fuse and a relay each use an effect of an electric current. Which effect of an electric current is used by a fuse and which effect is used by a relay? effect used by a fuse heating effect heating effect magnetic effect magnetic effect effect used by a relay heating effect magnetic effect heating effect magnetic effect PhysicsndMathsTutor.com
12 24 fter some building work in a house, a bare (uninsulated) wire is left protruding from a wall. What is the greatest hazard? a fire a fuse blows an electric shock no current flows PhysicsndMathsTutor.com
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