RESISTORS, INDUCTORS AND CAPACITORS 0 RESISTORS AND RESISTANCE 1 / 30 Category: Electrical 5 Ohm’s law states that resistor ‘R’ is directly proportional to Capacitance Current Inductance Voltage 2 / 30 Category: ELECTRICAL 2 What do the first three-color bands on a resistor indicate? The resistance material The resistance tolerance in percent The power rating in watts The value of the resistor in ohms 3 / 30 Category: Physics Practice Test 5 When the condition R1/R2 = R3/R4 is satisfied, the current in the galvanometer of Wheatstone bridge is 0 R1/R3 R3/R2 1 4 / 30 Category: Electric Circuits You have to replace 1500 ohms resistor in radio. You have no 1500 ohms resistor but have several 1000 ohms ones. which you would connect three in parallel three in series two in parallel two in parallel and one in series 5 / 30 Category: ELECTRICAL 2 When two 500 ohm 1 watt resistors are connected in parallel, they can dissipate a maximum total power of 1/2 watt 1 watt 2 watt 4 watts 6 / 30 Category: Electrical 5 A 5.0 ohm of resistor has current i=6.0sinωt(A), than power dissipated by the circuit will be 80sin²ωt 11sin²ωt 30sin²ωt 180sin²ωt 7 / 30 Category: Electric Circuits Two resistors are said to be connected in series when total current equals the sum of branch currents sum of IR drops equals the applied e.m.f both carry the same value of current same current passes in turn through both 8 / 30 Category: Electric Circuits The resistance of a conductor varies inversely as resistivity length temperature area of cross-section 9 / 30 Category: ELECTRICAL 2 Which tolerance rating would a high-quality resistor have? 20% 0.1% 10% 5% 10 / 30 Category: Electrical 5 Those resistors, which values change with applied voltage and temperature are called variable resistor constant resistor linear resistors non linear resistors 11 / 30 Category: Electric Circuits The internal resistance of an ideal voltage source is very high infinite zero very low 12 / 30 Category: Physics Practice Test 5 The Gold color of the resistance shows a tolerance up to the 5% 0.02 10% 0.01 13 / 30 Category: Electric Circuits The resistivity of a conductor with an increase in temperature. decreases remains the same increases zero 14 / 30 Category: Physics Practice Test 5 The voltage of a device having resistance 5 Ω and current 4 A will be 25 V 20 V 15 V 10 V 15 / 30 Category: ELECTRICAL 2 If two 10 ohm resistors are connected in series with a 10 volt battery, the power consumption would be: 5 watts 10 watts 20 watts 100 watts 16 / 30 Category: Electrical 5 A 4.0 ohm of resistor has current i=2.5sinωt(A), than voltage across the circuit will be 6.5sinωt 10.0sinωt 8.5sinωt 5.0sinωt 17 / 30 Category: ELECTRICAL 2 The total resistance of four 68 ohm resistors wired in parallel is: 17 ohms 12 ohms 34 ohms 272 ohms 18 / 30 Category: ELECTRICAL 2 What voltage would be needed to supply a current of 200 mA, to operate an electric lamp which has a resistance of 25 ohms? 5 volts 175 volts 8 volts 225 volts 19 / 30 Category: ELECTRICAL 2 A resistor with a colour code of brown, black, and red, would have a value of: 10 000 ohms 10 ohms 1000 ohms 100 ohms 20 / 30 Category: ELECTRICAL 2 What does the fourth color band on a resistor mean? The value of the resistor in ohms The resistance tolerance in percent The power rating in watts The resistance material 21 / 30 Category: ELECTRICAL 2 If a current of 2 amperes flows through a 50-ohm resistor, what is the voltage across the resistor? 100 volts 52 volts 48 volts 25 volts 22 / 30 Category: ELECTRICAL 2 The total resistance of resistors connected in series is: equal to the highest resistance present less than the resistance of any one resistor equal to the lowest resistance present greater than the resistance of any one resistor 23 / 30 Category: Physics Practice Test 5 If Current is 0.75 A when a battery of 1.5 V is connected to the wire of 5 m having cross sectional area 2.5 × 10-7 m², the wire will have a resistivity of 2.1 × 10^-7 2 × 10^-7 1.1 × 10^-7 1 × 10^-7 24 / 30 Category: ELECTRICAL 2 Which series combination of resistors would replace a single 120 ohm resistor? six 22 ohm five 24 ohm two 62 ohm five 100 ohm 25 / 30 Category: ELECTRICAL 2 Why do resistors sometimes get hot when in use? Their reactance makes them heat up They absorb magnetic energy which makes them hot Some electrical energy passing through them is lost as heat Hotter circuit components nearby heat them up 26 / 30 Category: ELECTRICAL 2 If a carbon resistor’s temperature is increased, what will happen to the resistance? It will stay the same It will change depending on the resistor’s temperature coefficient rating It will become time dependent It will increase by 20% for every 10 degrees centigrade 27 / 30 Category: ELECTRICAL 2 One advantage of replacing a 50 ohm resistor with a parallel combination of two similarly rated 100 ohm resistors is that the parallel combination will have greater resistance and similar power rating the same resistance but lesser power rating the same resistance but greater power rating lesser resistance and similar power rating 28 / 30 Category: ELECTRICAL 2 Two resistors are in parallel. Resistor A carries twice the current of resistor B, which means that: the voltage across A is twice that across B A has half the resistance of B B has half the resistance of A the voltage across B is twice that across 29 / 30 Category: ELECTRICAL 2 In a parallel circuit with a voltage source and several branch resistors, how is the total current related to the current in the branch resistors? It decreases as more parallel resistors are added to the circuit It is the sum of each resistor’s voltage drop multiplied by the total number of resistors It equals the sum of the branch current through each resistor It equals the average of the branch current through each resistor 30 / 30 Category: Electric Circuits Which of the following material has nearly zero temperature co-efficient of resistance? Carbon Copper Manganin Porcelain Your score is LinkedIn Facebook Twitter Restart quiz Exit Send feedback
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