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