A circuit is set up to test two different resistors. Resistor 1 has a resistance of 4 ohms and Resistor 2 has a resistance of 2 ohms. Which resistor will have the bigger current flowing through it, if the potential difference is constant?

A current,  , flows through a resistor of resistance,  .Find the potential difference,  , across the resistance.

Two unequal resistors are connected in series with a battery, then which of the following option is true? Only one correct answerA.Potential drop across smaller resistor is moreB.Potential drop across larger resistor is moreC.Potential drop across both the resistors is sameD.Current flowing through the smaller resistor i

If in a circuit both the potential difference and resistance are doubled, then:(a) current is doubled. (b) current is halved. (c) current remains same. (d) current is four times.

A resistor is described as being ‘ohmic’.  Which of the following statements does NOT apply to it?When the potential difference across the resistor doubles, the current through it will double too (so long as the temperature and other physical conditions do not change)The current through the resistor is inversely proportional to the potential difference across itA graph of I against V for the component will be a straight line through the originWhen the p.d. across the component is increased from 2 to 4 V, the current through it will increase from 1.2 to 2.4 A2A variable resistor is set to a value of 5 ohms, and a current-voltage (I-V) graph (with I on the y-axis and V on the x-axis) is plotted for it.  Its resistance is then doubled to 10 ohms.  What effect will this have on its I-V graph?It will have no effect on its I-V graphThe slope (gradient) of the graph will increaseThe entire graph will move upwardsThe slope (gradient) of the graph will decrease3If a current of 4 A flows through a motor when a potential difference of 12 V is applied across it, calculate its resistance.0.33 Ω3 Ω48 Ω6 Ω4A student wishes to measure the resistance of a filament bulb.  Which of the following should they do?Connect an ammeter and a voltmeter, both in seriesConnect a voltmeter in parallel and an ammeter in seriesConnect a voltmeter in series and an ammeter in parallelConnect an ammeter and a voltmeter, both in parallel5Which of the following does NOT require the use of an LDR?A smartphone screen with an automatic brightness settingA thermostatThe automatic headlights on a carThe shutter of a digital camera6A student connects a cell, a filament bulb and a diode in series to one another.  The diode is forward-biased.  What will happen to the bulb when the leads attached to the diode are swapped around?It will flash on and offIt will get brighterNothing (its brightness will not change)It will turn off

An electric circuit consists of a variable resistor connected to a source of constant potential difference. What will happen to the current running through the circuit if the resistance of the resistor is doubled?*1 pointdoubledhalvedquadrupledquartered