CURRENT ELECTRICITY

Define current

• rate of flow of charges

• movement of electrons

• electricity flowing from point to point

the SI unit of current is the ......................

The voltage across the terminals of a cell when the switch is closed is called

• E.M.F

• Potential difference

What is the potential difference between points A and B if a charge of 5C does 100 joules of work?

• 20V

• 500V

• 0.05V

why is a voltmeter connected in parallel with the device across which the voltage is being determined?

• because of high resistance

• because the voltage is higher than current

• because it can't measure voltage in series

State Ohm's law

• current flowing through a conductor is directly proportional to the potential difference across it, provided temperature and other physical conditions are kept constant

• voltage across a conductor is directly proportional to the current through it, provided temperature and other physical conditions are kept constant

• resistance of current through a conductor is directly proportional to the temperature of the conductor

the following factors affect resistance of conductor. which one does not

• temperature

• length of the conductor

• cross sectional area

• surface area of the conductor

What is the amount of charge flowing through a bulb if a current of 2A is provided for 2.5 minutes

• 5C

• 300C

• 75C

In which connection will the bulbs be brighter

• A

• B

• They will have same brightness

• none of the above

Name the two main defects in this type of cell