3_6 DC Circuits

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

• 500 ohms

• 5 ohms

• 5,000 ohms

A conductor with a positive Q (charge) of 4C has 12.56 x 1018 electrons added to it. It will have a Q =.

• 6

• 2

• zero

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

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

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

• 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 circuit?.

• 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 10V battery supplies a resistive load of 10 ohms for 1 minute. What is the work done?.

• 60J

• 600J

• 10J

A galvanometer measures.

• millivolts

• megohms

• milliamps

The voltage at point A is.

• 28 V

• 21 V

• 7 V

A loss of electrical insulation results in.

• an open circuit between the supply and earth.

• a short circuit between the supply and earth.

• an open circuit in the supply.

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

• 10V

• 4 V