SAEED MDCAT
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If I, R and t are the current, resistance and time respectively, then according to Joule's law heat produced will be proportional to
Specific resistance of all metals is mostly affected by
1 Watt =
The length and radius of an electric resistance of a certain wire are doubled simultaneously, then the:
Calculate the time taken for the charges to complete the circuit if the total charges were 5000 Coulomb and the current of the circuit was 20 Amp?
SI Unit of voltage is?
The resistance and length of wire are
A potentiometer is used to measure the emf of a cell. At null point, no current flows through_______
The graphical representation of Ohm's law is
Two copper conductors have equal length. The crosssectional area of one conductor is four times that of the other. If the conductor having smaller crosssectional area has a resistance of 40 ohms the resistance of another conductor will be
A galvanometer acting as a voltmeter will have a coil with
Ohm's law is applicable to
Find the current if power given is 5 Watts and voltage is 0.5 volts.
When bulb is turned on, ohm's law is applicable
Which one of the following is a disadvantage of a potentiometer over a voltmeter?
1/Req = 1/R1 + 1/R2 + 1/R3 +….. +1/Rn is the combination in
Value of current in a short circuit is ______
What is the relationship between Power, Current and Resistance?
The fractional change in resistance per kelvin is known as
If a current of 5 Amperes flows through the conductor. The number of electrons per second will is:
Resistance of a conductor depends upon
A resistance of 40 Ohms is attached to a circuit having current of 300 Amp, Find its voltage.
A 200watt bulb operates in a 220V circuit. Find the current.
A current of 5A flows in a resistor of 2 ohms. Calculate the energy dissipated in 300 seconds in the resistor.
Calculate the work done in a resistor of 20 ohm carrying 5A of current in 3 hours.
Maximum power is delivered when internal resistance of the source equals
Resistance of a material always decreases if
1 microvolt is
4000 Coulomb charges were passing from the wire for about 12 seconds. Estimate the current during this process?
Calculate the charge passing through the circuit if it's current it 10 Amp and the recorded time is 15 seconds
1 kilo ohm = _________ ohm
An apparatus which is used to measure current voltage and resistance
The specific resistance of a conductor increases with:
As compared to thin wires, thick wires have
The circuit which gives continuously varying potential is called
A potential difference of 10 V is applied across a conductor whose resistance is 2.5ohm. What is the value of current flowing through it?
Electric current may be defined as
Volts / Ampere = _________
Two incandescent light bulbs of 40 W and 60 W ratings are connected in series across the mains. Then
When 2Ω, 4Ω and 6Ω resistors are connected in parallel their resultant equivalent resistance will be:
Correct form of ohm's law:
Four wires of same material, the same crosssectional area and the same length when connected in parallel give a resistance of 0.25 ohms. If the same four wires are connected is series the effective resistance will be:
Basically a potentiometer is a device for
The length of a conductor is halved. Its resistance will be :
A neon flashlight cell with an emf of 1.5V gives a current of 15A when connected directly to an ammeter of resistance 0.04Ω. The internal resistance of the cell is
Two wires of copper are of the same length but ‘have different diameters. When they are connected in series across a battery, the heat generated is H1 When connected in parallel across the same battery, the heat generated during the same time is H2 Then:
A wire has a resistance of 5.5 Ω at 19oC and 21.5 Ω at 200oC Find the temperature coefficient of resistivity(α) of the material.
A wire of uniform area of crosssection A and length L is cut into two equal parts, the resistivity of each part is:
Which one of the following does not have negative temperature coefficient?
Reciprocal of resistivity is called
Req = R1 + R2 + R3 +….. + Rn is the combination in
Find the resistance if voltage of the circuit is 45 volts and current 30 Amp?
An electrical instrument which is used to measure potential difference between two points is called:
An electric filament bulb can be worked from
PD stands for
Galvanometer is an
In parallel voltage remains?
Which of the following has a negative temperature coefficient of resistance?
Emf becomes equal to terminal potential difference when
When the length of the conductor is doubled and the area of crosssection remains the same then is resistance
Resistivity of a wire is ___ ohmm if 0.75 A current flows through it by applying 1.5V potential difference, take length and cross section as 5m and 2.5 x 107 m2.
Steady current does not change with respect to ________.
The SI unit of power is?
___________ relationship exists between current and voltage in terms of Ohm's law.
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