Electricity and magnetism — IGCSE Sciences - Co-Ordinated (0973) questions by topic

In which circuit can the brightness of the lamp be varied continuously? Four circuit diagrams are shown, each containing a cell and a lamp. Circuit A contains a fixed resistor in…

A 12 Ω resistor is connected in parallel with a 17 Ω resistor. Which statement about the combined resistance of the two resistors is correct? A It must be equal to 29 Ω. B It must…

The voltage across an electric heater is 240 V and the current in the heater is 3.0 A. The heater is connected in a circuit with a fuse. Which fuse rating is the most suitable? A…

Which circuit is suitable for determining the resistance of the fixed resistor? Each option shows a cell, a switch and the fixed resistor, with a voltmeter (V) and ammeter (A)…

The diagram shows a circuit containing three cells, a variable resistor and an electric motor, all connected in series. Which actions together must increase the speed of the…

The diagram shows a 3.0 ohm resistor connected to a 6.0 ohm resistor. What is a possible combined resistance of the two resistors? A 2.0 ohm B 3.0 ohm C 4.5 ohm D 9.0 ohm

An electric kettle is rated at 3.0 kW and is connected to a 250 V supply. The kettle is switched on for 2.0 minutes. Which row shows the current in the kettle and the energy…

The diagram shows resistors of resistance R1 and R2 connected in parallel. The combined resistance of the resistors is RT. Currents I1, I2 and I3 are labelled. In the circuit, a…

The diagram shows the direction of the current in a wire. The wire is placed between the poles of a magnet and this causes a force to act on the wire. The N pole is on the left…

A student makes an electromagnet with a steel core. There is a problem with the electromagnet. Which problem with the electromagnet is caused by using a steel core? A The…

There is a current of 100 mA in a circuit. How much charge flows through the circuit in 1.5 minutes? A 0.15 C B 9.0 C C 150 C D 9000 C

A student connects a length of metal resistance wire to a battery. The circuit is a single loop containing a battery (cells) and the metal resistance wire, with the current…

A student uses the following equipment to determine the resistance of a lamp: 2 cells ammeter connecting wires lamp switch voltmeter Draw the circuit diagram for the circuit that…

Fig. 12.1 shows the circuit symbols for three electrical components, X, Y and Z, used in an electric torch (flashlight). Component X is the symbol for a cell (a long line and a…

Fig. 12.1 shows a 10 ohm resistor and a resistor R of unknown resistance connected in parallel with a 1.8 V cell. R is on one branch and the 10 ohm resistor is on a parallel…

A cell is connected in a circuit. Which statement describes how the electromotive force (e.m.f.) of the cell is measured? A It is measured in newtons using a newton meter…

In the circuits shown, all the resistors are identical. [Circuits A-D: identical resistors in series/parallel combinations; B has the resistors arranged to give the smallest…

The maximum current in an electric circuit is 10 A. What is the most appropriate rating of a fuse for this circuit? A 5 A B 9 A C 13 A D 25 A

A current-carrying wire passes through a flat card. The arrow on the wire shows the direction of the current. [Diagrams A-D: concentric circular field lines on the card around the…

When two different, uncharged, insulating materials are rubbed together, one becomes positively charged and the other becomes negatively charged. What happens to cause the…

For which quantities is the unit the volt? A current and potential difference (p.d.) B electromotive force (e.m.f.) and potential difference (p.d.) C electromotive force (e.m.f.)…

A 2.0 ohm resistor and a 1.0 ohm resistor are connected in series with a cell. [Circuit diagram: 2.0 ohm and 1.0 ohm resistors in series with a cell.] Which statement about…

A coil lies between the poles of a magnet. There is a current in the coil and this causes a turning effect. Which change does not increase the turning effect on the coil? A…

A bar of soft iron and a bar of steel are held in contact with a strong magnet. Both bars become magnetised. The two bars are now moved away from the magnet. Which statement about…

The current in an ammeter is 1.5 A. How much charge passes through the ammeter in one minute? A 0.025 C B 1.5 C C 40 C D 90 C

Two resistors with different resistances are connected to a power supply. The resistors can be connected either in parallel or in series. Which statement is correct? A For…

There is an alternating current (a.c.) in a metal wire. Which statement about the current is correct? A It is a flow of both positively and negatively charged particles. B It is a…

A 100% efficient step-down transformer has 120 turns on its primary coil and 10 turns on its secondary coil. A 240 V supply provides 48 W of power to the primary coil. What is the…

The diagram shows two soft-iron rods JK and LM placed between the poles of two magnets (N pole on the far left, S pole on the far right). Which row shows the poles induced in the…

The graph shows how the resistance of a thermistor changes with temperature (resistance / kohm falling from 6.0 as temperature rises). There is a potential difference of 6.0 V…

A kettle is connected to a 230 V mains supply. The current in the kettle is 10 A. How much energy is transferred in 3.0 minutes? A 12.8 J B 767 J C 6900 J D 414 000 J

What is the function of a fuse in a circuit? A It decreases the resistance of the circuit. B It ensures a constant current in the circuit. C It ensures a constant resistance in…

What is the purpose of the commutator in a direct current (d.c.) motor? A It reverses the direction of the current in the coil every half turn. B It reverses the direction of…

A torch contains two cells, a lamp and a switch connected in series. Fig. 3.1 shows an incomplete circuit diagram for the torch. Complete the circuit diagram in Fig. 3.1 for the…

The driver of a car fills the fuel tank with gasoline (petrol). As the gasoline flows into the fuel tank, the gasoline becomes charged. State the force that causes the gasoline to…

A student is investigating electrical circuits. Fig. 12.1 shows a circuit with a 6.0 V battery, an ammeter, a resistor R and a voltmeter across R. The ammeter reads 0.50 A and the…

Two insulators are charged by rubbing them with a cloth. After this, the charged insulators repel each other. Which statement is a possible description of how the insulators…

A battery of e.m.f. V is connected across a resistor of resistance R. There is a current in the resistor. [Circuit diagram: battery V connected to resistor R, current flowing.]…

Fuses are used in domestic electric circuits. Which statement about fuses is correct? A A fuse is connected in the live wire. B A fuse is connected in the neutral wire. C A 3.0 A…

A straight wire carries a current into the page. [Diagrams A-D: concentric circular field lines around a wire carrying current into the page, with differing directions.] Which…

A plastic rod is rubbed with a cloth and the rod becomes positively charged. What happens during this process? A Negative charges move from the cloth to the rod. B Negative…

Which material is used for the core of an electromagnet? A aluminium B copper C iron D steel

The diagrams show four identical resistors connected together in different arrangements. [Diagrams A-D: series/parallel combinations of four identical resistors; D = all in…

There is a current-carrying wire perpendicular to the page. The direction of the current is into the page. [Diagrams A-D: concentric circular field lines around the wire with…

Two insulators are charged by rubbing them with a cloth. After this, the charged insulators repel each other. Which statement is a possible description of how the insulators…

A battery of e.m.f. V is connected across a resistor of resistance R. There is a current in the resistor. [Circuit diagram: battery V connected to resistor R, current flowing.]…

An electric kettle is connected to a 250 V supply. The current in the heating element of the kettle is 10 A. How much electrical energy is transferred in 3.0 minutes? A 75 J B…

Fuses are used in domestic electric circuits. Which statement about fuses is correct? A A fuse is connected in the live wire. B A fuse is connected in the neutral wire. C A 3.0 A…

Which material is used for the core of an electromagnet? A aluminium B copper C iron D steel

There is a current-carrying wire perpendicular to the page. The direction of the current is into the page. [Diagrams A-D: concentric circular field lines around the wire with…

When a straight conductor moves through a magnetic field, an electromotive force (e.m.f.) is induced between the ends of the conductor. Which factor does not affect the magnitude…

The diagram shows a current-carrying conductor in a magnetic field. The magnetic field is directed from the N pole (left) to the S pole (right) and the direction of the current is…

Fig. 9.1 shows a washing machine. The washing machine uses a heater to heat the water and a motor to pump the hot water through the machine. The motor and the heater are connected…

Fig. 9.1 shows an electric circuit with two filament lamps X and Y in series, ammeter A2 (before) and ammeter A1 (after). When the switch is closed, ammeter A2 shows a reading of…

A student investigates how the resistance of a wire changes with length using the equipment in Fig. 9.1 (1.5 V cell, ammeter, wire, ruler, crocodile clips). The student moves the…

A student investigates series and parallel circuits using filament lamps. Fig. 9.1 shows the first circuit using three identical filament lamps in series across a 6.0 V supply,…

Three charged balls P, Q and R are suspended by insulating threads. Ball P is negatively charged. Ball Q is brought close to ball P and the balls move away from each other. Ball Q…

Which two electrical quantities are measured in the same unit? A current and potential difference (p.d.) B current and electromotive force (e.m.f.) C potential difference (p.d.)…

A battery is connected in a circuit to a 3.0 ohm resistor, a 6.0 ohm resistor and two ammeters P and Q. The resistors are in parallel; ammeter P reads the total current and…

The current in an electric kettle used to boil water is 9.0 A. What is the most appropriate rating of fuse to use with this kettle? A 1 A B 3 A C 8 A D 13 A

Three charged balls P, Q and R are suspended by insulating threads. Ball P is negatively charged. Ball Q is brought close to ball P and the balls move away from each other. Ball Q…

A battery is connected in a circuit to a 3.0 ohm resistor, a 6.0 ohm resistor and two ammeters P and Q. The resistors are in parallel; ammeter P reads the total current and…

The current in an electric kettle used to boil water is 9.0 A. What is the most appropriate rating of fuse to use with this kettle? A 1 A B 3 A C 8 A D 13 A

Fig. 6.1 shows an incomplete circuit diagram with lamp A, lamp B and a component X. Complete the circuit diagram in Fig. 6.1 by adding an ammeter to measure the current in lamp A…

A student investigates electromagnetic induction by dropping a magnet (N at top, S at bottom) through a coil of wire connected to a device measuring induced e.m.f. (Fig. 9.1).…