Recent content by momomo_mo

  1. M

    Simple electronic

    hi That's the question. I have done an experiment. The voltage of a free DC power supply was set to 5V. When it was connected to a circuit, its voltage dropped to 3V. What happened? Isn't the 2V is lost in the internal resistance of the power supply. However,the power supply will...
  2. M

    Terms nodes ,loop and branches which applied to the circuits

    HI everyone I am confused by the terms nodes ,loop and branches which applied to the circuit.
  3. M

    Motor and inductor

    SORRY I think it will be easier for the readers to read my question by using flow chart.I apologized for my poor english because I usually weak in expressing my point of view in English.I used to write in Chinese.Really sorry.Sorry for all the readers.Sorry for my distrubance.
  4. M

    Motor and inductor

    HeLPplease
  5. M

    Motor and inductor

    In these two cases , emf will be induced in different way. for motor: current +B-field-->Force-->Coil rotate-->change of magnetic flux-->emf inducedd in the coil for inductor , when the switch suddenly openfrom closes switch, there are a sudden change of magnetic flux ,there emf will be...
  6. M

    Volume of gas

    I want to ask if I have 2 cylinder container 1) 50 m3 2) 60 m3 If I inject the same no. of mole of gases into these containers respectively when I apply PV=nRT Is the volume in calculating the gases in these containers are the same??
  7. M

    Rate of reaction

    Since I carry out a microscale experiment , So I need to use "DROPS". So the total volume should kept constant because I can accurately measure the densisities of cpds? But I am not fully understand it The experiment that I carried out is to find the relationship between conc. of reactant and...
  8. M

    Rate of reaction

    Can anyone help me?
  9. M

    Soft iron core

    I see.Thanks for your information provided.
  10. M

    Alternating current

    I see your point.Thanks
  11. M

    Rate of reaction

    I am currently doing an experiment. The experiment is to investigate the dependence of reaction rate on conc. for the reaction between sodum thiosulphate reacts with dilute acids By varying concentrations of thiosulphate and H+ respectively in 2 experiments.We can easily find that speed of...
  12. M

    Alternating current

    In an LR circuit with alternating current , it is know that the inductance of the cable is of the order 10^-7 . With a 2 ohm resistor ,the circuit is used to measure inductance.There are 2 frequencies , 100kHZ and 1M Hz,that can be chosen for the measurement . So whyI MHz is better . I know...
  13. M

    Soft iron core

    I would like to know what is the function of soft iron core? Is there a difference in function when inserting soft iron core in inductor , motor , generator ? Thank you
  14. M

    Stationary wave

    Questions again!!!!!!! AS I know stationary can be produced by the reflection of waves in a closed tube.But how can stationary still be produced in an open tube?? Thanks for your help
  15. M

    CR and LR circuits

    Assume there is a capacitor and resistance connecting in series in a.c. Now channel 1 of the CRO acroos both the capaciotr and resistor and channel 2 across the resistor.The trace on channel 1 was taken as the p.d. across the capacitor and that on channel 2 as the current through the capacitor...
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