Electric Circuits Answers

In an experiment to determine the relationship between the current I through a piece of tungsten wire and the potential difference V across it, the theoretical relationship used was i=kv^n where k and n are constants which may be obtained from a straight line graph of the form y=mx + c, the symbols having their usual meaning. The corresponding linear equation for this experiment is............??

2 bulbs 40W and 60W and rated voltage 240V are connected in series across a potential difference of 420V. Which bulb will work at above rated voltage?

An electric kettle uses 2 resistors, if one is use it takes 6 mins to boil water, the 2nd resistor takes 8 mins to boil the same quantity of water. what time it would take if they are connected in
(i)series and
(ii) parallel
Please explain in detail.

Please explain the relationship between electrical susceptibility and dielectric constant.

Two resistances 2Ω and 3Ω are in parallel. The combination is in series with
15Ω resistance and a power supply of voltage V. There is a current of 3A through the 2Ω
resistance. What are the values of the current I delivered by, and the voltage V across the power supply?
3A and 10.5V
4A and 9V
4A and 12V
12A and 18V

One end of a simple rectangular wire-loop current balance is inserted into a solenoid. A force of
3.0×10−3N
is found to act on this end when a current of 2.0A is flowing in it. If the length of the conductor forming the end of the the wire-loop is 0.10m. What is the magnetic flux density in the solenoid?

why does current flow in opposite direction to the flow of electron?

how does potential difference is created by a batery?

10 The advantage of potentiometer over voltmeter in measurements of emf is that? athe potentiometer wire is assumed to be uniform b) it does not draw current from the circuit under test c) the temperature of the wire must remain constant d) faults may arise due to breaks or wrong connections in the circuit
11 Which of these is not a useful precaution in an electrical experiment? a) key should be removed between readings to avoid battery run-down b) jockeys should be dragged on resistance wires c) the connections in the circuit should be tight d) readings should be recorded as soon as they are obtained
12 Which of the following is not true about a rheostat? a) It is a constant current instrument b) It is a variable resistor with moving contact c) It is used for varying the current in a circuit d) It is used for varying the resistance in a circuit

A certain resistance thermometer at triple point of water is 152.0 ohms. What is the temperature of the system in degrees celsius when the resistance of the thermometer is 230.51ohms.