Three effects: heating, mechanical/ magnetic and electrochemical. 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's rotation causes the deflection of both wind and water currents. A device for producing electric current is called a (a) Galvanometer (b) Motor (c) Generator (d)Ammeter (c) Generator 2. Therefore, at constant voltage, the effect of a change in current outweighs the effect of the corresponding change in 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 … Wherever may be the types of current measuring instrument in one word all current measuring instruments are called ammeter. There are three metals with magnetic properties: iron, nickel and cobalt. 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 … Heating these metals will reduce their magnetization to the point where magnetism is completely eradicated. The push-pull effect of alternating current which makes it possible for motors to turn. 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. Electric Current and Its Effects Class 7 Science Extra Questions Short Answer Type Questions. Well, AC current also produces heat when it is passed through this same resistance. Current flowing through the diode times voltage drop across the diode equals power dissipated in the diode. ), but double the current and you quadruple the power (fantastic!). That is, this heating effect varies with the square of the current (I2) for a specific resistance (R). Name two electric devices for each where (a) heating effect of current is used and (b) magnetic effect of current is used. The Earth is rotating, and that rotation also causes rotation of the winds on the surface, called the Coriolis effect. Electric current electrochemical effects. This is among the chemical effects of electric current. So the current is what really matters. 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. 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. 11.5, where π ab is the Peltier coefficient: In other words, the heat is proportional to the resistance, but also proportional to the square of the current. Magnetism. Question 1. 1. This desired effect is used in several types of High Carbon (above 0.50 carbon) steel – Example: Tool Steel. An ammeter is always connected in series with the path of which the current to be measured. In both cases, this heating effect is proportional to I2R. So the current has much more effect on the heat produced than the resistance. Reversing the direction of current flow will cause the heating and cooling effects to switch junctions. [NCERT Exemplar] Answer: (a) Heating effect of current is used in electric heater and geyser. They are known as ferromagnetic metals. RMS Voltage and Current- Explained. 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