B. The lamp will be brighter if the secondary loops are increased<\/span><\/span><\/p>\n C. The lamp will be dimmer if the primary voltage is increased<\/span><\/span><\/p>\n D. The lamp will be lighter if t<\/span><\/span>he primary loops are reduced<\/span><\/span><\/p>\n E. The light will be the same if loops are changed<\/span><\/span><\/p>\n Solution<\/span><\/span><\/p>\n The change in the number of coil loops affects only the type of transformer<\/a>. If the primary loops reduced so that the secondary loops are more then this transformer becomes a step-up transformer that raises the voltage. Likewise, when the coil loops are coupled so that the secondary coil loops is less then this transformer becomes a step-down transformer that lowers the voltage.<\/span><\/span><\/p>\n Keep in mind that when the power voltage increases, the electric current<\/a> strength decreases so that the electric power<\/a> is constant (P = V I). Electrical power is the change of electrical energy<\/a> over a certain time interval. When the input power is equal to the output power the amount of energy consumed is also the same.<\/span><\/span><\/span><\/p>\n The correct answer is E.<\/span><\/span><\/span><\/p>\n 2. The image below describes the ideal transformer. The primary coil is connected to a voltage source and the secondary coil is connected to a lamp (L). Then the condition of the lamp will be…<\/span><\/span><\/p>\n B. Dimmed when primary voltage increased<\/span><\/span><\/p>\n C. Bright when secondary loops are increased<\/span><\/span><\/p>\n D. Dimmed when secondary loops are increased<\/span><\/span><\/p>\n E. Brighter when the primary loops are reduced<\/span><\/span><\/p>\n Solution :<\/span><\/span><\/p>\n Input power = P = V I = (200 Volt)(2 Ampere) = 400 Watt = Output power<\/span><\/span><\/p>\n The transformer only reduces the voltage but does not reduce the electrical power. Electric power kept constant therefore when the electric voltage decreases, the electric current increases (P = V I). The input electrical power the same as the output power so that the electrical energy used during a certain time interval is also the same. Thus light is normal or unchanged.<\/span><\/span><\/p>\n The correct answer is A.<\/span><\/span><\/p>\n 3. <\/span><\/span><\/p>\n The secondary coil is connected to a bulb lamp, while the primary coil is connected to a voltage source. The light bulb will turn on …<\/span><\/span><\/p>\n A. brighter if the number of primary loops is increased B. brighter if the number of secondary loops is increased<\/span><\/span><\/p>\n C. brighter if the number of secondary loops is equal to the primary<\/span><\/span><\/p>\n D. dimmed when the primary voltage is increased<\/span><\/span><\/p>\n E. dimmed when the primary voltage and the number of secondary loops are increased<\/span><\/span><\/p>\n Solution<\/span><\/span><\/p>\n There is no <\/span><\/span>correct <\/span><\/span>answer<\/span><\/span><\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"![\"Transformer](\"https:\/\/gurumuda.net\/physics\/wp-content\/uploads\/2018\/06\/Transformer-and-electric-energy-\u2013-problems-and-solutions-1.png\")
A. The lamp will dim if the primary loops are reduced<\/span><\/span><\/p>\n
\nLight or dim light is associated with many or at least electrical energy that is converted into light energy. If a lot of electrical energy is converted into light energy then a bright light, otherwise if a little electrical energy is converted into light energy then the light is dim. The electric power is constant, the electric energy is also constant so the light is the same.<\/span><\/span><\/span><\/p>\n![\"Transformer](\"https:\/\/gurumuda.net\/physics\/wp-content\/uploads\/2018\/06\/Transformer-and-electric-energy-\u2013-problems-and-solutions-2.png\")
A. Normal brightness when the primary loops are changed<\/span><\/span><\/p>\n![\"Transformer](\"https:\/\/gurumuda.net\/physics\/wp-content\/uploads\/2018\/06\/Transformer-and-electric-energy-\u2013-problems-and-solutions-3.png\")
<\/span><\/span><\/p>\n