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Worksheets1_D C Circuits
Total questions: 22
Worksheet time: 7mins
Avni is trying to understand the mathematical form of Ohm's Law. Which of the following equations represents Ohm's Law?
V=IR
V/I=R
I=V/R
All of the above
Ohm's Law is not applicable to
Linear devices
Non linear devices
Metallic conductors
Non metallic conductors
Zener diode
Ohm's law is applicable only when
Current is constant
Voltage is constant
Power is constant
All physical conditions are constant
Imagine Carol is working on a project that involves electrical circuits. He needs to apply Ohm's Law for AC circuits. What is the mathematical form of Ohm's Law for AC circuits?
(a)
If a number of resistors are connected in parallel, then the reciprocal of total resistance is equal to
Sum of individual resistances
Sum of the reciprocal of individual resistances
Reciprocal of the sum of individual resistances
All of these
According to Kirchoff’s voltage law,
The algebraic sum of all the e.m.f’s in the circuit is zero
Algebraic sum all the voltage drops in the circuit is zero
Algebraic sum of e.m.f’s plus algebraic sum of voltage drops is equal to zero
All of these
In any network of wires carrying currents, the algebraic sum of all currents meeting at a point is equal to
Sum of all the currents
Zero
Sum of outgoing currents
Sum of incoming currents
Which among the following is true about ohm’s law?
I ∝ V
I = V/R
V = IR
All of these
The unit of electrical energy is
Joules
Watt - sec
Kilowatt - hour
All of these
Electrical work is
Directly proportional to the potential difference
Directly proportional to the charge
Directly proportional to the current
All of these
If a current of 5A flows through a resistor of 12 ohm then the power developed and the energy dissipated in 2 minutes are
300 W, 36000 J
360 W, 30000 J
380 W, 35000 J
380 W, 36000 J
The parameters which remain constant across all circuit elements in a series circuit
Voltage
Current
Both voltage and current
Neither voltage nor current
Many resistors connected in series will?
Divide the voltage proportionally among all the resistors
Divide the current proportionally
Increase the source voltage in proportion to the values of the resistors
Reduce the power to zero
The current division to each branch of a parallel circuit depends upon
the the time for which the circuit is ON
the value of the resistors
the applied voltage
none of these
In an electrical circuit, where should Kirchhoff's Voltage Law (KVL) be applied?
In a closed loop known as a mesh
At a connection point known as a node
Both in a mesh and at a node
Neither in a mesh nor at a node
In a networking class, Kavya was asked to apply KCL to determine the current flowing through a circuit. Which part of the circuit should she consider while applying KCL?
Mesh
Node
Both Mesh and Node
Neither Mesh nor Node
A classroom has a 250V projector that carries a current of 0.3A. Calculate the power consumed by the projector.
75W
50W
25W
90W
Kilowatt-hour(kWh) is a unit of?
Current
Power
Energy
Resistance
Calculate the energy consumed by a toaster of 20 ohm resistance consuming 5A of current for 3 hours.
1.5J
15J
1.5kWh
15kWh
In a circuit at Apeksha's house, Kirchhoff’s Voltage Law states that in any closed loop, the algebraic sum of the applied EMFs is equal to the
algebraic difference between any two voltage drops
the algebraic sum of applied currents
sum of the algebraic resistance values
algebraic sum of I*R voltage drops
In a household with multiple appliances, the voltage across each appliance connected in parallel will
be greater than the main power supply voltage
always be the same
be equal to the sum of the voltages across each appliance
always be equal to 230 V
Which of the following does not represent power dissipation in an electrical circuit?
V2/R
I2R
VI
I2/R
