A compass needle is placed near a straight current-carrying wire. The compass needle deflects because, the wire becomes hot, the current produces a magnetic field around the wire, the wire becomes magnetic permanently, the battery attracts the compass, Which change will make an electromagnet stronger?, Reducing the number of turns, Removing the iron core, Using a plastic core, Increasing the current through the coil, Which combination is needed to make a simple voltaic cell?, Two different metals and an electrolyte, Two identical metals and pure water, One metal and an insulator, One metal and distilled water, A lemon battery stops working after the copper strip is removed. This shows that, the LED is defective, the lemon alone produces electricity, two different electrodes are required, the electrolyte is unnecessary, A student replaces lemon juice with pure water in a voltaic cell. The LED does not glow because, pure water is a poor electrolyte, water damages the LED, copper melts in water, zinc cannot react with water, Which statement correctly explains why a dry cell is more suitable for portable devices?, It produces more voltage than all batteries., It contains no chemicals., Its electrolyte is in the form of a paste., It does not use electrodes., A rechargeable battery differs from an ordinary dry cell because it, produces AC current, can be restored by charging, never becomes weak, contains no electrolyte, Why does an old rechargeable battery require frequent charging?, The charger becomes weak., Electricity leaks out continuously., The battery becomes lighter., Its chemicals gradually lose their ability to store energy efficiently., An electric heater uses nichrome wire because nichrome, is magnetic, has high resistance and produces heat, melts easily, is the best conductor of electricity, A lifting electromagnet suddenly stops lifting paper clips, but the coil is still warm. The most likely reason is, the coil has become a permanent magnet, the paper clips became non-magnetic, the battery has become weak, the iron has completely lost its magnetic property, Which of the following devices works mainly because of the magnetic effect of electric current?, Electric heater, Electric iron, Toaster, Electromagnet, Which of the following is NOT a rechargeable device?, Ordinary wall clock, Electric vehicle, Laptop, Mobile phone, The main purpose of the electrolyte in a voltaic cell is to, keep the electrodes cool, stop current flow, support the chemical reaction that produces electricity, increase the size of the battery, Which statement about an electromagnet is correct?, It produces magnetism only while current flows., It remains magnetic even when current stops., It does not require an iron core., It cannot attract iron objects., A student wants to increase the lifting power of an electromagnet. Which change would NOT help?, Using more cells, Removing the iron nail, Increasing the number of turns of the coil, Using a soft iron core

Electricity effects

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