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Who Wants To Be A Millionaire? Electricity and Magnetism Question 1 An ammeter is used for measuring A B C D Electrical charge Circuit temperature Electrical current Potential difference Answer A B C D Electrical charge Circuit temperature Electrical current Potential difference £100 Question 2 Brushes on an electric motor connect to the A B C D commutator communitarianist communist commentator Answer A B C D commutator communitarianist communist commentator £200 Question 3 Doubling the number of turns on a solenoid will A Increase the magnetic force B Increase the current C Decrease the magnetic force D Increase the voltage Answer A Increase the magnetic force B Increase the current C Decrease the magnetic force D Increase the voltage £300 Question 4 I kWh of electrical energy costs 5p. What is the cost of running a 10 kW oven for 5 hours? A B C D £5 £25 25p £2.50 Answer A B C D £5 £25 25p £2.50 £500 Question 5 A copper wire carrying an electrical current A Has no magnetic field around it B Has a magnetic field around it C Only has a north pole D Only has a south pole Answer A Has no magnetic field around it B Has a magnetic field around it C Only has a north pole D Only has a south pole £1,000 Question 6 Which of the following is the correct rule for electric motors? A Fleming’s right hand rule B C The right hand grip The left hand grip D Fleming’s left-hand rule Answer A Fleming’s right hand rule B The right hand grip The left hand grip C D Fleming’s left-hand rule £2,000 Question 7 The resistance value of two 10 Ω resistors in parallel is A B C D 0.5 Ω 20 Ω 5Ω 2Ω Answer A B C D 0.5 Ω 20 Ω 5Ω 2Ω £4,000 Question 8 The relationship between voltage and current in Ohm’s law is A B C D V=IxR R= V x I I=VxR V = I/R Answer A B C D V=IxR R= V x I I=VxR V = I/R £8,000 Question 9 Which one is wrong: ‘A current in a wire is induced when’ A a wire is moved between the poles of a magnet B a coil is moved to and fro across a wire C a magnet is moved in and out of a coil D a wire moves faster and faster in a magnetic field Answer A a wire is moved between the poles of a magnet B a magnet is moved in and out of a coil C a coil is moved to and fro across a wire D a wire moves faster and faster in a magnetic field £16,000 Question 10 The value of the secondary voltage in a transformer is calculated using A B C D V xV = N x N V/N =N /V V /V =N /N V x I =V x I s p s p s p s p s p s p p p s s Answer A B C D V xV V/N V /V V xI s p s p s p p p =N xN =N /V =N /N =V x I s p s p s s p s £32,000 Question 11 High voltage AC is used to transmit electrical power because A Heat loss is inversely proportional to the current B Transformers heat up more with DC C Heat loss is proportional to the current squared D Low voltage produces more heat Answer A Heat loss is inversely proportional to the current B Transformers heat up with DC C Heat loss is proportional to the current D Low voltage produces more heat £64,000 Question 12 A device that relies upon eddy currents is A B C D A generator A metal detector A loudspeaker A transformer Answer A B C D A generator A metal detector A loudspeaker A transformer £125,000 Question 13 This AC generator’s electrical output shows that the rotor was rotated how many times? A B C D Once Twice Three times Four times Answer A B C D Once Twice Three times Four times £250,000 Question 14 Three-phase output from a power station alternator results from A 3 Stator and rotor coil wire thicknesses used B 3 different speeds of rotation are sequenced C 6 stator coils and 6 rotor coils are set at 60o in the plane of rotation D 3 stator coils and 3 rotor coils are set at 120o in the plane of rotation Answer A 3 Stator and rotor coil wire thicknesses are used B 3 different speeds of rotation are sequenced C 6 stator coils and 6 rotor coils are set at 60o in the plane of rotation D 3 stator coils and 3 rotor coils are set at 120o in the plane of rotation £500,000 Question 15 Temp sensor Light sensor A B C D NOT gate To turn the heater ON the Temp sensor and Light sensor must be AND gate Heater control Temp 1, Light 1 Temp 0, Light 0 Temp 0, Light 1 Temp 1, Light 0 Answer A B C D Temp 1, Light 1 Temp 0, Light 0 Temp 0, Light 1 Temp 1, Light 0 £1,000,000