Revision: Practical Electricity Report a question What's wrong with this question? You cannot submit an empty report. Please add some details. 17 Practical Electricity - Revision Quiz Test your understanding of Practical Electricity here: 1 / 5 1) What is the current flowing through an appliance marked "240 V, 40 W"? 6.00 A 0.17 A 6.67 A 3.00 A 2 / 5 2) Most hair dryers don't have an earth wire. Why is this so? The fan prevents the heating coil from becoming too hot. The current is too small. The plug is installed with a fuse. The casing is plastic. 3 / 5 3) An electric kettle with a cable to a three-pin plug is connected to a 240 V mains and the switch of the kettle is turned on to boil some water. If the live wire and the neutral wire inside the three-pin plug are mistakenly interchanged, which of the following will happen? The metal casing of the kettle will still be at a high potential of 240 V even when the switch of the kettle is turned off. The fuse in the three-pin plug will blow. The heating element inside the kettle will still be at a high potential of 240 V even when the switch of the kettle is turned off. The kettle will not operate. 4 / 5 4) What is the power produced by an appliance marked "240 V, 2 A"? 60 W 480 W 8.3 mW 120 W 5 / 5 5) An electric kettle rated at '220 V, 2000 W' is filled with 1.0 kg of water. The kettle is plugged into a 110 V power supply. Which of the following quantities is halved, compared to the normal operation? The current flowing through the kettle. The energy consumed to boil the water. The power of the kettle. The resistance of the kettle. Your score is Restart quiz
