1. 45 A of current passes through a cross section of wire. How many charges pass through in 3 seconds?
A. 9.375 x 10^19
B. 3.59 x 10^16
C. 2.16 x 10^17
D. 8.4 x 10^20

2. A 30 ohm resistor dissipates 500W of power. What current is running through the resistor?
A. 15000 A
B. 16.6 A
C. 4.06 A
D. 0.052 A

3. How is current affected if the number of charge carriers decreases?
A. The current increases.
B. The current decreases.
C. The current initially decreases and then is gradually restored.
D. The current is not affected.

4. The current in an electron beam in a cathode-ray tube is 7.0 x 10^-5 A. How much charge hits the screen in 5.0 s?

5. A wire carries a steady current of 0.1 A over a period of 20 s. What total charge moves through the wire in this time interval?

Solution Preview

1.)
Because, I = q/t,
i.e.,
45A current means 45 coulomb charge pass throgh the given cross section in 1 second.

Therefore, the charge which can pass through the given cross-section in 3 seconds = 3*45 = 135 Coulomb
Because, ...

Solution Summary

The solution applies simple, easy-to-understand formulae linking charge and current together in order to answer these short multiple choice questions concerning charge carriers and current through resistors.

... Determine the voltage across resistor R2 immediately after and ... C, a power supply ε, two resistors of resistances R1 ... can be solved to obtain the charge on the ...

... br>Before that, we have to determine the charging current required for ... Since there is a 5 ohm resistor in series with ...current is 22/5 Amp = 4.4 A <br> <br>Lets ...

... For any parallel circuit having two resistors of R1 and R2 with current I1 and I2 ... The force is perpendicular to both the velocity v of the charge q and the ...

... of the circuit in question, the current that initially ... all the supply voltage appears across the resistor as it ... according to the time constant to charge up the ...

... each of the currents that flow through the individual resistor branches, ie ... Electric current is defined as the rate of change of electrical charge per second ...

... How many electrons does the charge from Question 14 represent ... 20 ohm resistor and a 30 ohm resistor are wired ... Three resistors, 10, 20, and 30 ohms, are wired in ...

... But the current I that goes through the resistor is also the same current that goes through the ... The current is defined as the change in the charge as a ...

... of 0.15 mA is used with a shunt resistor to make ... The circuit in the drawing contains two resistors and two ... switch is closed, the capacitors begin to charge up. ...

... only d. A combination of inductors and resistors e. A ... a diode so that a continual flow of charge results ... diode connected to an ac source allows current to flow ...

... combination and there will be no current in the circuit and the potential drop across the resistors will be ... The charge on the capacitor combination is given by. ...