DC circuits EASA Questions

A potential difference of 50 volts produces a current of 10 milliamperes through a resistance of.

• 500 ohms

• 5 ohms

• 5000 ohms

A conductor with a positive Q (charge) of 4C has 12.56 x 10^18 electrons added to it. It will have a Q =.

• 6

• 2

• 0

The power dissipated by a load of known resistance connected across a known potential difference can be calculated by.

• A)dividing the square of the potential difference by the value of the load resistance.

• B)multiplying the square of the potential difference by the value of the load resistance.

• C)working out the current flowing in the circuit by using ohms law and multiplying the result by the resistance.

A current of 5A flows for 2 minutes. How many coulombs passed a point in the

• 2.5

• 600

• 100

A circuit has a current flow of 6A. If the voltage is trebled, the new current will be.

• 6A.

• 18A.

• 2A.

A 3, 5 and 2 ohms resistance is connected in series with a 10 V battery. The voltage across the 2 ohms resistor is.

• 2 v

• 10 v

• 4 v

What is the PD of a circuit which has a 40 mA current and a 1 kilohm resistance?.

• 40 v

• 400 v

• 4 v

. Three branches in a circuit have currents entering 3A, 4A, and 5A. A fourth branch has 10 A leaving. A fifth branch must have.

• 22A leaving.

• 2A leaving.

• 2A entering.

In a circuit containing three resistors of equal value connected in parallel, one resistor goes open circuit. The current in the other two resistors will.

• decrease.

• increase.

• remain the same.

20 amperes flow for 20 seconds. How many coulombs have flowed?.

• 1.

• 20.

• 400