10th science physics: Electric current and its effects Formative AssessmentsGuess Paper SA-1- 2011 - X -Science-Electricity and its effects
Chapter: Current Electricity Worksheet by Jsunil Tutorial
1. Define electric current,
state its unit, list the equation defining electric current.
2. List three types of
energy that may be used to produce current, and list three devices that provide
this type of energy.
3. List three types of
loads and list the energy conversions taking place inside each one.
4. What is the definition
of voltage? What is its unit?
5. Prove that 1 J is
equivalent to 1 Vx A x s.
6. How long does it take a
current of 5.0 mA to deliver 15 C of charge?
7. What is the potential
difference between two points if 1.0 kJ of work is required to move 0.5 C of
charge between the two points?
8. What is the voltage of a
source which provides 12.0 J to each Coulomb of charge present?
9. What is the energy of an
electron accelerated through a potential difference of 100.0 kV? (charge of an
electron 1.6 x 10 -19Coulomb)
10. What is the potential
difference between two points when a charge of 80.0 C has 4.0 x 10^3J of energy
supplied to it as it moves between the two points?
11. There is a current of
0.50 A through an incandescent lamp for 5.0 min, with a voltage of 115 V. How
much energy does the current transfer to the lamp? What is the power rating of
the lamp?
12. If there is a current
of 2.0 A through a hair dryer transferring 15 kJ of energy in 55 s, what is the
potential difference across the dryer?
13. An electric drill
operates at a potential difference of 120V and draws a current of 6.0 mA. If it
takes 45 s for the drill to make a hole in a piece of wood, how much energy is
used by the drill?
14. An electric toaster
operating at a potential difference of 115 V uses 34 200 J of energy during the 20 sec
it is on. What is the current through the toaster?
15. A motor draws a current
of 2.0 A for 20.0 sec in order to lift a small mass. If the motor does a total
of 9.6 J of work calculate the voltage drop across the motor.
16. In a lightning
discharge, 30.0 C of charge moves through a potential difference 108
V in 20 min. Calculate the current of the lightning bolt.
17. How much energy is
gained by an electron accelerated through a potential difference of 3.0 x 10^2
V?
19. How much energy is
required to dry your hair if the hair dryer draws 12.0 A from a 110 V outlet
for 12.0 min?
Electric Circuits:
1. a) Describe the
difference between current in a series circuit and current in a parallel
circuit.
b) Describe the difference
between voltage in a series circuit and voltage in a parallel circuit.
2. Draw a schematic diagram
of the following circuit: One power source and a resistor are connected in
series with a combination of 3 light bulbs connected in parallel with each
other. Include a fuse, 4 switches, a voltmeter, and an ammeter. The fuse should
protect the whole circuit, one switch should shut off the whole circuit and the
other switches should control the individual bulbs. The ammeter should read I
and the voltmeter the voltage of the resistor.
3. a) What is a short
circuit?
b) Why is it dangerous?
c) Give two ways to protect
against short circuits.
4. Describe the effect on
the rest of the bulbs in problem two when one burns out. Will the remainder
glow brighter? dimmer? What will be the effect on the source?
5. Describe resistance,
list 4 factors affecting resistance.
6. A conductor has a length
of 2.0 m and a radius of 3.0 mm. If the resistance is R = 100 S, calculate the
new resistance if the same material has:
a) length = 6.0 m and r =
6.0 mm
b) length = 1.0 m and r =
1.0 mm
7. List two ways to
increase the current drawn by a circuit.
8. Draw a graph of V-I for
2 resistors and indicate which has the greatest resistance and why.
9. A voltmeter measures a voltage
drop of 60.0 V across a heating element while an ammeter reads the current
through it as 2.0 A. What is the resistance of the heating coil?
10. How much current flows
through a 7.5 S lightbulb with a potential difference of 1.5 V?
11. What is the voltage
drop across an element which draws a current of 5.0 A and has a resistance of
40 ohms?
12. A set of 6 motors is
connected in series to a 120 V source drawing 1.0 A of current. Find:
a) R total
b) R of each motor
c) Voltage drop across each
load.
13. Do resistors in
parallel increase or decrease total resistance?
14. What resistance must be
added in series to a circuit containing a 33 ohm resistor in in
order to draw 2.0 A of current from a 120V source?
15. How much energy is
dissipated in 10 minutes when a current of 4.0 A is flowing through a potential
drop of 60.0 V?
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