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Weekend Quiz. Back to Basics.

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Q.1. There are two resistors in series in a circuit, of 18 Ohms and 22 Ohms resistance. The current through the 18 Ohm resistor is 6 Amps. Calculate the supply Voltage to the circuit.


Q.2 There are three resistors of resistance 20 Ohms, 10 Ohms and 8 Ohms connected in parallel to a 6 Volt D.C. supply. Calculate:


a, The total resistance.


b, The current taken from the supply.


Q.3. A coil of 30 Ohms reactance is connected to a 200 Volt A.C. supply circuit, in series with a of 50 Ohms resistance. A capacitor of 30 Ohms reactance is connected in series with the coil. Calculate,


a, The circuit impedance.


b, The current drawn from the supply.


c, The power used.


Q.4. An electric heater uses 5.4MJ in 45 minutes. What is the rating of the element?


a, 1kW.


b, 1.5kW.


c, 2kW,


d, 3kW.


Q.5 The input of an electric motor is 5.8kW. The output is 4.75kW. The efficiency is,


a, 1.05%


b, 10.5%


c, 82%


d, 122%


Z.


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    AncientMariner:

    The 18 ohm and the 22 ohm resistors are in series, thus the circuit resistance of the two resistors in series is 40 ohms. If 6 Amps flows through one resistor, then there must be the same current flowing through the other. So from V = I x R   6 amps x 40 ohms = 240 volts.


    Clive 




    I did the 18 ohm 6amp calc then applied 22ohm 6amp and added them together to get the answer, same answer but a bit clumsy. I did a couple more but all in mee heed. No calculator with me to speak about, then i gave up being away from home . A few days by the lake, nice countryside even in this weather

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  • 0

    AncientMariner:

    The 18 ohm and the 22 ohm resistors are in series, thus the circuit resistance of the two resistors in series is 40 ohms. If 6 Amps flows through one resistor, then there must be the same current flowing through the other. So from V = I x R   6 amps x 40 ohms = 240 volts.


    Clive 




    I did the 18 ohm 6amp calc then applied 22ohm 6amp and added them together to get the answer, same answer but a bit clumsy. I did a couple more but all in mee heed. No calculator with me to speak about, then i gave up being away from home . A few days by the lake, nice countryside even in this weather

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