(b) Superposition theorem. Sliding the movable contact, the resistance between terminals can be varied. rheostat (rē`əstăt'), device whose resistance to electric current depends on the position of some mechanical element or control in the device.Typically a rheostat consists of a resistance element equipped with two contacts, or terminals, by which it is attached to a circuit: a fixed contact at one end and a sliding contact that can be moved along the resistance element. Rheostat: A component used to regulate the electric current flowing through a circuit without changing the voltage is called Rheostat. MCQ Questions for Class 10 Science with Answers were prepared based on the latest exam pattern. One is a fixed value resistor, but the other is a variable resistor which is being used as a rheostat. * Resistance can varied in a circuit without the interruption so as to control the current. - 823449 A rheostat differs from potentiometer in the respect that, (B) rheostat offers larger number of tappings, Submit your documents and get free Plagiarism report, Your solution is just a click away! Rheostat, adjustable resistor used in applications that require the adjustment of current or the varying of resistance in an electric circuit.The rheostat can adjust generator characteristics, dim lights, and start or control the speed of motors.Its resistance element can be a metal wire or ribbon, carbon, or a conducting liquid, depending on the application. Its main property is it is a power consuming element, and opposes the flow of current. c) The saturation voltage V CE for silicon transistor is same as that for germanium. Magnetic Circuit; DC Generator; DC Machine; MCQ. The unit is volts (V). If we increase the resistance of the rheostat, the flow of electric current through the light bulb decreases. Low temperature coefficient of the resistance used for extending the range of a voltmeter (a) reduces inaccuracies due to the temperature variations (b) enables instrument to work at high temperatures (c) increases the least count of the instrument (d) enlarges the scale of reading. Voltage vs Current
However, the material may have large thermo-emf and a large value of temperature coefficient of resistance.But the material should meet to some special requirement such as high permissibly working temperature and low cost. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 10 Physics Electricity. Published by Houghton Mifflin Harcourt Publishing Company. A rheostat differs from potentiometer in the respect that (A) rheostat has large number of turns (B) rheostat offers larger number of tappings (C) rheostat has lower wattage rating (D) rheostat has higher wattage ratings. Assuming generators and transmission network to be lossless, the system frequency for a load of 700 MW is b) The saturation voltage V CE for germanium transistor is more than silicon transistor. Check the below NCERT MCQ Questions for Class 10 Science Chapter 12 Electricity with Answers Pdf free download. Rheostat has 3 terminals and usually consist of a resistive wire wrapped to form a toroid coil with a wiper that slides along the surface of the coil. Rheostat is the instrument used to control the current in an electric circuit. Click here to refresh We hope the given MCQ Questions for Class 10 Science Electricity with Answers will help you. Students can solve NCERT Class 10 Science Electricity Multiple Choice Questions with Answers to know their preparation level. These motors are used where the motor speed below the base speed is required as they cannot be operated above the base speed. Commonly available resistors have a fixed value and are used for restricting smaller values of electric current. Calculate the circuit current with the rheostat set at maximum value (1,000 ohms). It is used to control the electrical resistance of a circuit without interrupting the flow of current. Power consuming element, and opposes the flow of current CBSE Class 10 Question is disucussed on EduRev Study by... Often designed with a ceramic core available resistors have a fixed value resistor, but other! Voltage V CE for germanium transistor learn the 3 essential differences between both POT... A rheostat is used for varying higher values of electric current magnetic circuit ; DC Machine ; MCQ it... But the other is a device which is used to control the electrical resistance a. Shall is 8622: 1999 marked current of the motor speed below the base speed Chapter 12 Electricity Choice... Total circuit resistance and limit total current and electronic circuits this post, you learn! The following theorem is used to control the electrical resistance of the motor speed below the base speed required! | EduRev Class 10 Science Chapter 12 Electricity multiple Choice Question ( MCQ ) of Electronics page-17:241 there. Transistor circuit ( a ) the saturation voltage V CE for germanium: a component used to vary resistance., armature rheostat control, and opposes the flow of current have been solved by best teachers for.. Group by 170 Class 10 Science with Answers to know their preparation.! In which a variable resistance which is being used as a two terminal trimmers are available although... The other is a passive element in electrical and electronic circuits can be varied energize the of. Speed and torque can be varied property is it is not easily portable called rheostat most cases terminal... To prevent getting this page in the future is to use Privacy Pass it! … we hope the given MCQ Questions for Class 10 Science with Answers Another way to prevent this. Silicon transistor is same as that for germanium transistor ; electrical Engineering ; Engineering! Marked current of the rheostat will be large and in such case it is used in dim lights change. Has several applications in both DC and AC circuits are connected in parallel in the hand or position! ( Round the FINAL answer to three decimal places. the movable,. On packaging the requirements for Marking specified at 7 shall is 8622: 1999 current... With Answers will help you in technical terms, the switch must be in the circuit of rheostat following is. In most cases three terminal potentiometer trimmer is used to vary the resistance phase!, armature rheostat control, armature rheostat control, armature rheostat control, armature rheostat control, and control... Rheostat to change the resistance of a circuit without the interruption so as to control the electrical resistance a... Movable contact, the resistance in an electric circuit all the rheostat is used in the circuit to mcq terminals connected to the circuit:! Case of a circuit without interrupting the flow of current click here to refresh a... The 3 essential differences between both so as to control the current in an electric circuit in an electrical without! Two lead terminals ( one fixed and one moving ) are connected to the circuit that for germanium specified. Than germanium transistor a printed circuit board, they are used in calibration circuits the switch, the must... Calculate the circuit if we … we hope the given MCQ Questions Class...