Results 1 to 4 of 4

Math Help - 4 Quick Questions on Electrical Energy

  1. #1
    Member
    Joined
    May 2008
    Posts
    101

    Lightbulb 4 Quick Questions on Electrical Energy

    1) The wire of an electric light globe must be/have:
    a] Low resistance
    b] High resistance
    c] Made of copper {definitely wrong}
    d] Very thick and short

    2) A car battery gives out electricity for a longer time than a dry cell because:
    a] It is bigger than a dry cell
    b] It contains more liquid than a dry cell
    c] It can be recharged, dry cells can't
    d] Can be given distilled water, dry cells can't

    3) Voltage could be best described as:
    a] Magnetic pressure
    b] Electrical current
    c] Resistance
    d] Electrical pressure

    4) How can you prevent static electricity build up?

    Thanks to anyone who helps.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Like a stone-audioslave ADARSH's Avatar
    Joined
    Aug 2008
    From
    India
    Posts
    726
    Thanks
    2

    Wink ..

    Hello! BG5965,
    1) High resistance
    2) it can b recharged
    3) Electrical pressure
    4) i suppose it should b earthing.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by ADARSH View Post
    Hello! BG5965,
    1) High resistance
    2) it can b recharged
    3) Electrical pressure
    4) i suppose it should b earthing.
    It is pointless answering these if you don't provide an explanation.

    Also 2 cannot be right.

    For 2: given that the electrolyte and materials of the cathode and anode are different between the cells there is no simple answer (in fact we know that car batteries are usually lead acid (HCl) cells, but what kind of dry cell are we talking about?).

    Other things being equal larger size = greater energy storgage so with the same load longer discharge time. So that would suggest that (a) is the intended answer to a very badly formulated question.

    RonL
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Like a stone-audioslave ADARSH's Avatar
    Joined
    Aug 2008
    From
    India
    Posts
    726
    Thanks
    2

    Red face

    my apologies for that
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Generalised energy and energy (lagrangian mechanics)?
    Posted in the Advanced Applied Math Forum
    Replies: 2
    Last Post: January 16th 2012, 03:03 AM
  2. Physics Questions (Electrical Energy)
    Posted in the Math Topics Forum
    Replies: 3
    Last Post: August 25th 2009, 09:21 AM
  3. Electrical Maths Questions
    Posted in the Advanced Applied Math Forum
    Replies: 1
    Last Post: September 22nd 2008, 03:32 AM
  4. Some Questions concerning Work, Energy and motion...
    Posted in the Advanced Applied Math Forum
    Replies: 2
    Last Post: May 18th 2008, 01:16 PM
  5. Replies: 7
    Last Post: April 17th 2006, 01:04 PM

Search Tags


/mathhelpforum @mathhelpforum