TYS 5105 C10 (Electric Charge and current of Electricity)

The diagram shows a circuit. The switch is closed. Which statement describes the movement of the electrons?

• The electrons are stationary.

• The electrons flow from X to Y

• The electrons flow from Y to X

• The electrons oscillate between X and Y.

Answer explanation

Using the circuit shown, the current I is found for various voltages V. The resistance of the resistor does not change. Which graph shows how the current varies with voltage?

• 
• 
• 
• 

Answer explanation

The diagram shows two lamps in parallel with a cell.

Which row shows the direction of conventional current in lamp P and the direction of electron flow in lamp Q?

• Current in Lamp P: →

  Flow in Lamp Q: →

• Current in Lamp P: →

  Flow in Lamp Q: ←

• Current in Lamp P: ←

  Flow in Lamp Q: →

• Current in Lamp P: ←

  Flow in Lamp Q: ←

Answer explanation

The potential difference (p.d.) across a resistor causes a current in the resistor. The p.d. and the resistance of the resistor can both be changed. Which changes will both increase the current in the resistor?

• change in p.d.:

  decrease,

  change in resistance:

  decrease

• change in p.d.:

  decrease,

  change in resistance:

  increase

• change in p.d.:

  increase,

  change in resistance:

  decrease

• change in p.d.:

  increase,

  change in resistance:

  increase

Answer explanation

The circuit shows a lamp connected to a 6.0V battery.

A current of 4.0A flows in the circuit for 20 s. How much charge flows through the lamp?

• 120C

• 8OC

• 24C

• 0.20C

Answer explanation

Which copper wire has the smallest resistance?

• a long, thick wire

• a long, thin wire

• a short, thick wire

• a short, thin wire

Answer explanation

The diagram shows a circuit with a 3.0 Ω resistor and a 2.0 Ω resistor connected in parallel.

The switch is open, and the ammeter reads 2.0A. When the switch is closed, the ammeter reads the total current through both resistors. What is the ammeter reading when the switch is closed?

• 1.2A

• 3.0A

• 4.0A

• 5.0A

Answer explanation

A series circuit is shown.

When 2 C of charge passes round the circuit, 6 J of work drives the charge through component S and 6J through component T. What is the electromotive force (e.m.f.) of the cell?

• 3V

• 6V

• 12V

• 24V

Answer explanation

Which statement correctly defines current?

• the amount of electric charge flowing

• the amount of energy flowing

• the rate of flow of electric charge

• the rate of flow of energy

Answer explanation

Electrons are charged particles. D 24V Which row identifies the charge on an electron and the unit of charge?

• type of charge:

  negative,

  unit of charge:

  ampere

• type of charge:

  negative,

  unit of charge:

  coulomb

• type of charge:

  positive,

  unit of charge:

  ampere

• type of charge:

  positive,

  unit of charge:

  coulomb

Answer explanation