Y11 Physics Circuits Revision

Compared with an Ohmic device, a non-Ohmic device has:

• constant resistance

• constant current

• variable resistance

• variable current

What is the conventional current in a wire in a circuit?

• The flow of electrons from positive to negative

• The flow of negative charges from negative to positive

• The flow of protons from negative to positive

• The flow of positive charges from positive to negative

Potential is best described as:

• rate of energy transfer between points in a circuit.

• current flow

• the amount of potential energy per charge.

• the potential energy in a circuit

A steady current of 2.0 A flows in a wire. How many electrons per second does this represent?

• 2.0

• 1.25 × 10¹⁹

• 1.6 × 10¹⁹

• 6.25 × 10¹⁸

What is the emf of an electrical cell if 625 J of energy is carried by 500 C?

• 0.0001V

• 0.8V

• 1.25V

• 312500V

A 2.0 kW heater radiates out heat energy to warm a room. How much energy per minute is this?

• 2000J

• 2J

• $1.2\times10^5$ J

• $1.2\times10^3$ J

In the voltmeter below, if the reading for V₂ is 7.0 V, what would be the reading for V₁?

• 5.0 V, because of Kirchhoff's conservation of energy law

• 5.0 V, because of Kirchhoff's conservation of current law

• 7.0 V, because of Kirchhoff's conservation of energy law

• 7.0 V, because of Kirchhoff's conservation of current law

In the ammeter below, if the readings for A₁ and A₂ are 250 mA and 100 mA respectively, what is the reading for A₃?

• 350 mA, because of Kirchhoff's conservation of energy law

• 350 mA, because of Kirchhoff's conservation of current law

• 350 mA, because of Kirchhoff's conservation of current law

• 150 mA, because of Kirchhoff's conservation of current law

A 12 V torch battery supplies a current of 0.50 A for 20 minutes. What is the quantity of charge delivered to the torch globe during that time?

• 6C

• 10C

• 60C

• 600C

A battery rated at 6.0 V delivers a current of 200 mA to a small light globe. How much electrical energy does the globe transfer into light and heat per second?

• 1200 J s^–1

• 12 J s^–1

• 1.2J s^–1

• 0.12 J s^–1