I have physics questions please help! they are on static and current electricity. help!?

An operating lamp draws a current of 0.50 ampere. The amount of charge passing through the lamp in 10. seconds is?

A lighting bolt transfers 6.0 coulombs of charge from a cloud to the ground in 2.0×10-3 second. What is the average current during this event?

A 12 volt automobile battery has 8.4×10 to the third power coulombs of electric charge. The amount of electrical energy stored in the battery is?

4 Answers

  1. 1 ampere = 1 coulomb / sec

    0.50 amp means 5 coulombs in 10 sec.

    6.0 coulombs in 2.0X10^-3 sec = (6.0/2.0)10^3 amp

    1 amp-hour = 1 coulomb/sec X 3600 sec = 3600 coulomb so

    8.4X 10^3 coulombs = 8.4 X 10^3/3.6X10^3 amp-hrs = 2.3amp-hrs which is how batteries are rated. The energy is 12V X 2.3 amp for one hour = 27.8 watt-hours

  2. Current is defined as: Coulombs/second, or

    I = q/t

    You should be able to use that formula to solve the first two.

    The second one is similar. This time you need to know that voltage is defined as: Joules/Coulomb or

    v = E/q

    You can re-arrange that for the energy stored.

  3. Lightning seeks the least complicated direction to floor. Rubber boots/footwear supply some insulation and protection. even nonetheless, lightning can bypass alongside the uninsulated area of the physique no rely if it relatively is an much less stressful direction than air and leap (arc) previous the boots/footwear to floor. it relatively is terrific to maintain a low profile (crouch) if caught exterior yet do not lay down as a results of fact the lightning can bypass alongside the floor close to a strike. greater valuable yet, seek for dry shelter in a construction. Lightning that strikes a tree can leap to those under the tree. Mr. pink exterior the tank might supply an much less stressful direction for lightning than air because it strikes the grounded tank and can desire to be electrocuted. Mr Blue interior the tank might desire to be risk-free as a results of fact the tank components a plenty much less stressful direction to floor than his physique.

  4. I think you are confused.Current electricity and static electricity are different

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