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WorksheetsCURRENT ELECTRICITY
Total questions: 20
Worksheet time: 30mins
Define current
rate of flow of charges
movement of electrons
electricity flowing from point to point
the SI unit of current is the (a)
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
(a)
In parallel arrangement of cells, the effective EMF in the circuit is equal to
the sum of individual EMF of the cells
the average of the EMF of the cells
difference in the EMF of the cells
the product of the EMF of the cells
Liquids that can conduct electricity like sulphuric acid are called
conductors
electrolytes
semiconductors
electroliquids
Polarization occurs when
zinc plate is 'eaten away' by sulphuric acid
hydrogen bubbles accumulate around the copper plate
sulphuric acid reacts with the zinc plate to form ions
current is produced in a simple cell due to chemical reaction
The following practices help in the maintenance of accumulators. List all that apply
electrolyte level should be checked regularly
large currents should not be drawn from the battery for a long time
keep the terminal clean and greased
ensure they are covered well
it should be left in a discharged condition for long
Why should the lights in a house be wired in parallel and not in series
little currents will be used
they work independently
it will reduce the cost of wiring
Which physical quantity is measured in Watt
Power
Resistance
Energy
Resistivity
Calculate the resistance produced when a current of 2x10-3A flows through a conductor connected to 10V source
5 Ω
5000 Ω
20000 Ω
Three resistors of 2.5Ohms, 10 Ohms and 6.5Ohms are connected in series. what single resistor can replace them
19 Ω
6.33 Ω
18.5 Ω
What is the effective resistance in the arrangement shown?
18 Ω
44 Ω
20 Ω
If a current of 2.5A is supplied to this arrangement, what is the voltage drop across the resistors
5V
4V
20V
3.2V
