11.5, where π ab is the Peltier coefficient: Name two electric devices for each where (a) heating effect of current is used and (b) magnetic effect of current is used. Question 1. This is among the chemical effects of electric current. Electric current. This electric potential energy is given to the electrons, and since the electrons try to minimize their electric potential energy, the electrons convert this electric potential energy into kinetic energy. Three effects: heating, mechanical/ magnetic and electrochemical. RMS Voltage and Current- Explained. An ammeter is always connected in series with the path of which the current to be measured. Wherever may be the types of current measuring instrument in one word all current measuring instruments are called ammeter. So the current has much more effect on the heat produced than the resistance. Diodes can break down at a voltage of a few hundred volts, so this can dump heat into the diode at a rate of hundreds or thousands of watts, heating up the … The Earth is rotating, and that rotation also causes rotation of the winds on the surface, called the Coriolis effect. Heating these metals will reduce their magnetization to the point where magnetism is completely eradicated. The movement of electricity along a path called a conductor. For example, decreasing the resistance (which, in and of itself, would tend to decrease resistive heating) causes the current to increase, which increases resistive heating by a greater factor. [NCERT Exemplar] Answer: (a) Heating effect of current is used in electric heater and geyser. Magnetism. The Earth's rotation causes the deflection of both wind and water currents. That is, this heating effect varies with the square of the current (I2) for a specific resistance (R). Electric current electrochemical effects. There are three metals with magnetic properties: iron, nickel and cobalt. Well, AC current also produces heat when it is passed through this same resistance. The reason for why wires heat up when a current flows through them is that a battery converts chemical energy into electric potential energy. Reversing the direction of current flow will cause the heating and cooling effects to switch junctions. In other words, the heat is proportional to the resistance, but also proportional to the square of the current. The current flow around the circuit will cause the junctions to absorb or dissipate heat, resulting in one junction heating up and the other cooling down. The push-pull effect of alternating current which makes it possible for motors to turn. When very high current is to be measured we use current transformers to step down current for measuring purpose. Electric Current and Its Effects Class 7 Science Extra Questions Short Answer Type Questions. Current flowing through the diode times voltage drop across the diode equals power dissipated in the diode. The transferred heat (Q p) is given by Eq. For example, when some current is passed through water, water ionizes into H + (aq) and OH – (aq) ions, where H + (aq) ions go towards the cathode to gain electrons and form H 2 whereas OH – (aq) ions go towards the anode to lose electrons and form O … So the current is what really matters. This desired effect is used in several types of High Carbon (above 0.50 carbon) steel – Example: Tool Steel. The larger the current, the greater the heat produced in a given circuit. A device for producing electric current is called a (a) Galvanometer (b) Motor (c) Generator (d)Ammeter (c) Generator 2. 1. Therefore, at constant voltage, the effect of a change in current outweighs the effect of the corresponding change in resistance. Double the resistance and you double the power (great! 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