They are known as ferromagnetic metals. Wherever may be the types of current measuring instrument in one word all current measuring instruments are called ammeter. Question 1. 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. 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. So the current has much more effect on the heat produced than the resistance. Double the resistance and you double the power (great! Current flowing through the diode times voltage drop across the diode equals power dissipated in the diode. The movement of electricity along a path called a conductor. 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. 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 … A device for producing electric current is called a (a) Galvanometer (b) Motor (c) Generator (d)Ammeter (c) Generator 2. Three effects: heating, mechanical/ magnetic and electrochemical. The reason for why wires heat up when a current flows through them is that a battery converts chemical energy into electric potential energy. An ammeter is always connected in series with the path of which the current to be measured. ), but double the current and you quadruple the power (fantastic!). 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. This is among the chemical effects of electric current. Heating these metals will reduce their magnetization to the point where magnetism is completely eradicated. So the current is what really matters. RMS, or root mean square (also called effective), voltage is a method of denoting a voltage sine waveform (AC waveform) as an equivalent voltage which represents the DC voltage value that will produce the same heating effect, … The Earth is rotating, and that rotation also causes rotation of the winds on the surface, called the Coriolis effect. Reversing the direction of current flow will cause the heating and cooling effects to switch junctions. The transferred heat (Q p) is given by Eq. Electric current electrochemical effects. [NCERT Exemplar] Answer: (a) Heating effect of current is used in electric heater and geyser. The larger the current, the greater the heat produced in a given circuit. Therefore, at constant voltage, the effect of a change in current outweighs the effect of the corresponding change in resistance. In both cases, this heating effect is proportional to I2R. The push-pull effect of alternating current which makes it possible for motors to turn. Magnetism. The Earth's rotation causes the deflection of both wind and water currents. In other words, the heat is proportional to the resistance, but also proportional to the square of the current. 1. Name two electric devices for each where (a) heating effect of current is used and (b) magnetic effect of current is used. That is, this heating effect varies with the square of the current (I2) for a specific resistance (R). Electric current. 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 … Well, AC current also produces heat when it is passed through this same resistance. 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