Electricity

The circuit shown contains three ammeters X, Y and Z.

Which ammeter has the largest reading?

• X

• Y

• Z

• They all have the same reading.

Two meters are connected in a circuit to measure the current in a component and the potential difference across the component.

Which meters are used and how are they connected to the component?

• an ammeter in parallel for current, a voltmeter in series for potential difference

• an ammeter in series for current, a voltmeter in parallel for potential difference

• a voltmeter in parallel for current, an ammeter in series for potential difference

• a voltmeter in series for current, an ammeter in parallel for potential difference

The diagram shows two resistors connected in a circuit.

What could be the combined resistance of this arrangement of resistors?

• 4.0 Ω

• 6.0 Ω

• 9.0 Ω

• 18 Ω

Why are lamps in a house lighting circuit connected in parallel rather than in series?

• If one lamp stops working, the remaining lamps become brighter.

• Less current is taken from the power supply.

• The lamps can be turned off independently using switches.

• When more lamps are added, their brightness decreases.

The diagram s hosw a cell connected to two 6.0 Ω resistors. Three currents,I₁, I₂ and I₃, are labelled.

Which row correctly compares I₂ and I₃ with I₁?

• I₂ : same as I₁ , I₃ : same as I₁

• I₂ : same as I₁ , I₃ : smaller than I₁

• I₂ : smaller than I₁ , I₃ : same as I₁

• I₂ : smaller than I₁ , I₃ : smaller than I₁

Four lamps are each labelled 240 V.

In which circuit do all four lamps have normal brightness?

• 
• 
• 
• 

The diagram shows a 40 Ω resistor and a 60 Ω resistor connected in parallel.

What is the total resistance between points P and Q?

• less than 40 Ω

• 50 Ω

• between 60 Ω and 100 Ω

• 100 Ω

A circuit is set up to determine the resistance of a resistor R. The meter readings are 2.0 A and 3.0 V.

What is the resistance of the resistor R?

• 0.67 Ω

• 1.5 Ω

• 5.0 Ω

• 6.0 Ω

The circuit diagram shows a 4.0Ω resistor and an 8.0 Ω resistor connected to a 6.0 V battery.

What is the current in the battery?

• 0.50 A

• 0.75 A

• 1.5 A

• 2.0 A

The diagram shows a 10 Ω resistor and a 20 Ω resistor connected in a potential divider circuit.

What is the reading on the voltmeter?

• 4.0 V

• 6.0 V

• 8.0 V

• 12.0 V