- [Hard]Engineers relate the current density inside a conductor to the local electric field through the material's conductivity, so which microscopic form of ...
- [Hard]A battery of emf 12 volts and internal resistance 3 ohm drives a variable load resistor, so for what load value is the power delivered to the load max...
- [Medium]Three identical cells, each with internal resistance 0.6 ohm, are connected in parallel to reduce the effective source resistance, so what is their co...
- [Medium]Four identical cells, each of emf 1.5 volts and internal resistance 0.2 ohm, are connected in series to power a small torch, so what is the net emf an...
- [Medium]Current passes through a 20 ohm resistor at 2 amperes for 5 minutes in a demonstration, so how much heat energy is produced in the resistor?...
- [Easy]An electric heater rated to carry 5 amperes operates across a 220 volt mains supply in a kitchen, so how much power does it consume?...
- [Medium]In a balanced Wheatstone bridge the galvanometer shows no deflection, so which relation among the four arm resistances P, Q, R and S must hold?...
- [Easy]Two resistors of 6 ohm and 3 ohm are wired side by side between the same two nodes of a circuit, so what is their combined resistance?...
- [Medium]A cell of emf 6 volts and internal resistance 0.5 ohm is connected to an external resistor of 2.5 ohm, so what current flows?...
- [Medium]While measuring a battery on a test bench, its terminal voltage drops from 12 volts on open circuit to 10.5 volts when delivering 3 amperes, so what i...
- [Easy]At a junction in a network, currents of 5 A and 3 A enter while currents of 4 A and I leave through separate branches, so what is I?...
- [Medium]Applying the loop rule around any closed mesh of a resistive network sets the algebraic sum of certain quantities to zero, so which principle does thi...
- [Medium]In a meter bridge the balance point is found at 40 cm from one end while the known resistance in the right gap is 6 ohm, so what is the unknown resist...
- [Medium]A potentiometer is often preferred over a voltmeter for measuring the emf of a cell accurately, so what is the key reason for this advantage?...
- [Easy]When a potential difference of 12 volts is applied across a resistor, a steady current of 3 amperes flows, so what is its resistance value?...
- [Easy]Three resistors of 2 ohm, 3 ohm and 5 ohm are joined end to end in a single line across a battery, so what is their equivalent resistance?...
- [Medium]The resistance of a metallic filament increases when it heats up during operation, so what best explains this rise in resistance with temperature?...
- [Medium]A uniform wire of resistance R is stretched so that its length doubles while its volume stays constant, so what is the new resistance?...
- [Easy]During a laboratory experiment a conductor passes a charge of 60 coulombs through its cross-section in exactly 2 minutes, so what is the current?...
- [Easy]A copper wire carries a steady current while free electrons drift slowly through it, so how does the drift speed compare with the electron random ther...
- [Easy]Three resistors 2 Ω, 3 Ω, 5 Ω in series. Equivalent resistance?...
- [Easy]Ohm's law states current through a conductor is directly proportional to?...
- [Medium]Two resistors 6 Ω and 3 Ω in parallel. Equivalent resistance?...
- [Easy]Power dissipated in resistor R with current I?...
- [Medium]Drift velocity v_d relates to current I by I = ?...
- [Easy]For metals, resistivity with temperature generally?...
- [Easy]Kirchhoff's junction law expresses conservation of?...
- [Medium]Terminal voltage V of cell with emf E and internal resistance r delivering current I?...
- [Hard]Balance condition for Wheatstone bridge (arms P, Q, R, S)?...
- [Medium]Potentiometer preferred over voltmeter for measuring emf because?...
- [Medium]Color bands Brown-Black-Red indicate resistance? (Third band μltiplier)...
- [Easy]SI unit (dimension) of conductivity σ?...
- [Easy]Energy dissipated in resistor R over time t with steady current I?...
- [Medium]Current density J relates to conductivity σ and electric field E by?...
- [Hard]n identical cells each emf E and internal resistance r in series (external R). Total emf and internal resistance?...