The transferred heat (Q p) is given by Eq. 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 … Wherever may be the types of current measuring instrument in one word all current measuring instruments are called ammeter. RMS Voltage and Current- Explained. Magnetism. 11.5, where π ab is the Peltier coefficient: This desired effect is used in several types of High Carbon (above 0.50 carbon) steel – Example: Tool Steel. Current flowing through the diode times voltage drop across the diode equals power dissipated in the diode. 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. They are known as ferromagnetic metals. Inside the magnet, the field lines moves (a) from north to south (b) from south the north (c) away from south pole (d) away from north pole (a) from north to south 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. A device for producing electric current is called a (a) Galvanometer (b) Motor (c) Generator (d)Ammeter (c) Generator 2. The push-pull effect of alternating current which makes it possible for motors to turn. Question 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! Three effects: heating, mechanical/ magnetic and electrochemical. 1. Name two electric devices for each where (a) heating effect of current is used and (b) magnetic effect of current is used. ), but double the current and you quadruple the power (fantastic!). The reason for why wires heat up when a current flows through them is that a battery converts chemical energy into electric potential energy. There are three metals with magnetic properties: iron, nickel and cobalt. Heating these metals will reduce their magnetization to the point where magnetism is completely eradicated. 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. 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 … 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. An ammeter is always connected in series with the path of which the current to be measured. Well, AC current also produces heat when it is passed through this same resistance. So the current has much more effect on the heat produced than the resistance. In other words, the heat is proportional to the resistance, but also proportional to the square of the current. 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. In both cases, this heating effect is proportional to I2R. 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