RESISTORS, INDUCTORS AND CAPACITORS 0 RESISTORS AND RESISTANCE 1 / 30 Category: Electrical 5 Ohm’s law states that resistor ‘R’ is directly proportional to Current Voltage Capacitance Inductance 2 / 30 Category: ELECTRICAL 2 Why do resistors sometimes get hot when in use? Hotter circuit components nearby heat them up Some electrical energy passing through them is lost as heat They absorb magnetic energy which makes them hot Their reactance makes them heat up 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 R3/R2 R1/R3 1 0 4 / 30 Category: ELECTRICAL 2 What does the fourth color band on a resistor mean? The value of the resistor in ohms The resistance material The resistance tolerance in percent The power rating in watts 5 / 30 Category: Physics Practice Test 5 The Potential difference of a battery is 2.2 V when it is connected across a resistance of 5 Ω. If suddenly the potential difference falls to 1.8 V, its internal resistance will be 1.1 Ω 1 Ω 2.1 Ω 2 Ω 6 / 30 Category: ELECTRICAL 2 The total resistance of four 68 ohm resistors wired in parallel is: 17 ohms 272 ohms 12 ohms 34 ohms 7 / 30 Category: Physics Practice Test 5 The Gold color of the resistance shows a tolerance up to the 0.02 5% 10% 0.01 8 / 30 Category: ELECTRICAL 2 Two resistors are connected in parallel and are connected across a 40 volt battery. If each resistor is 1000 ohms, the total current is: 80 amperes 80 milliamperes 40 amperes 40 milliamperes 9 / 30 Category: ELECTRICAL 2 What do the first three-color bands on a resistor indicate? The power rating in watts The resistance material The value of the resistor in ohms The resistance tolerance in percent 10 / 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 1.1 × 10^-7 2.1 × 10^-7 2 × 10^-7 1 × 10^-7 11 / 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 two in parallel and one in series three in parallel two in parallel three in series 12 / 30 Category: Electric Circuits Which of the following material has nearly zero temperature co-efficient of resistance? Copper Porcelain Carbon Manganin 13 / 30 Category: Electrical 5 Those resistors, which values change with applied voltage and temperature are called non linear resistors constant resistor variable resistor linear resistors 14 / 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 15 / 30 Category: Physics Practice Test 5 Bar of iron 2 cm × 2 cm having area 4 cm² and resistivity of 11 × 10^-8 Ω meter will have resistance of 3.1 × 10^-4 Ω 1.1 × 10^-4 Ω 2.1 × 10^-4 Ω 4.1 × 10^-4 Ω 16 / 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 the same resistance but lesser power rating greater resistance and similar power rating the same resistance but greater power rating lesser resistance and similar power rating 17 / 30 Category: Electrical 5 A 4.0 ohm of resistor has current i=2.5sinωt(A), than voltage across the circuit will be 8.5sinωt 10.0sinωt 6.5sinωt 5.0sinωt 18 / 30 Category: ELECTRICAL 2 When two 500 ohm 1 watt resistors are connected in parallel, they can dissipate a maximum total power of 2 watt 1 watt 4 watts 1/2 watt 19 / 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 equals the average of the branch current through each resistor It equals the sum of the branch current through each resistor It is the sum of each resistor’s voltage drop multiplied by the total number of resistors 20 / 30 Category: Electric Circuits The internal resistance of an ideal voltage source is very high infinite zero very low 21 / 30 Category: ELECTRICAL 2 Two resistors are in parallel. Resistor A carries twice the current of resistor B, which means that: B has half the resistance of A the voltage across A is twice that across B the voltage across B is twice that across A has half the resistance of B 22 / 30 Category: ELECTRICAL 2 If two 10 ohm resistors are connected in series with a 10 volt battery, the power consumption would be: 20 watts 10 watts 5 watts 100 watts 23 / 30 Category: Electric Circuits The resistance of a conductor varies inversely as area of cross-section length temperature resistivity 24 / 30 Category: Electric Circuits The resistivity of a conductor with an increase in temperature. zero decreases increases remains the same 25 / 30 Category: Physics Practice Test 5 The voltage of a device having resistance 5 Ω and current 4 A will be 15 V 10 V 25 V 20 V 26 / 30 Category: Electric Circuits Two resistors are said to be connected in series when sum of IR drops equals the applied e.m.f both carry the same value of current same current passes in turn through both total current equals the sum of branch currents 27 / 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 180sin²ωt 30sin²ωt 28 / 30 Category: ELECTRICAL 2 Which series combination of resistors would replace a single 120 ohm resistor? two 62 ohm six 22 ohm five 24 ohm five 100 ohm 29 / 30 Category: ELECTRICAL 2 The total resistance of resistors connected in series is: greater than the resistance of any one resistor equal to the lowest resistance present equal to the highest resistance present less than the resistance of any one resistor 30 / 30 Category: ELECTRICAL 2 If a 12-volt battery supplies 0.25 ampere to a circuit, what is the circuit’s resistance? 48 ohms 0.25 ohm 3 ohms 12 ohms Your score is LinkedIn Facebook Twitter Restart quiz Exit Send feedback
