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Electricity Problems. Una risorsa per il CLIL di Fisica in lingua inglese

red - Viene di seguito proposta una scheda di lavoro contenente alcuni problemi su resistori e potenza elettrica, utili per le classi V in cui sono attivi dei percorsi CLIL di Fisica in lingua inglese.

Resistance

1. A stereo with a resistance of 65 Ω is connected across a potential difference of 120 V. What is the current in this device?

2. The current in a microwave oven is 6.25 A. If the resistance of the oven’s circuitry is 17.6 Ω, what is the potential difference across the oven?

3. The current in a certain resistor is 0.50 A when it is connected to a potential difference of 110 V.What is the current in this same resistor if

a. the operating potential difference is 90.0 V?

b. the operating potential difference is 130 V?

Electric Power

1. A small electronic device is rated at 0.25 W when connected to 120 V. What is the resistance of this device?

2. An electric heater is operated by applying a potential difference of 50.0 V across a nichrome wire of total resistance 8.00 Ω. Find the current in the wire and the power rating of the heater.

Resistors in Series

1. A 4.0 Ω resistor, an 8.0 Ω resistor, and a 12.0 Ω resistor are connected in series with a 24.0 V battery.

a. Calculate the equivalent resistance.

b. Calculate the current in the circuit.

c. What is the current in each resistor?

2. A series combination of two resistors, 7.25 Ω and 4.03 Ω, is connected to a 9.00 V battery.

a. Calculate the equivalent resistance of the circuit and the current.

b. What is the potential difference across each resistor?

3. Several light bulbs are connected in series across a 115 V source of emf.

a. What is the equivalent resistance if the current in the circuit is 1.70 A?

b. If each light bulb has a resistance of 1.50 Ω, how many light bulbs are in the circuit?

Resistors in Parallel

1. A length of wire is cut into five equal pieces. The five pieces are then connected in parallel, with the resulting resistance being 2.00 Ω.What was the resistance of the original length of wire before it was cut up?

2. An 18.0 Ω, 9.00 Ω, and 6.00 Ω resistor are connected in parallel to an emf source. A current of 4.00 A is in the 9.00 Ω resistor.

a. Calculate the equivalent resistance of the circuit.

b. What is the potential difference across the source?

c. Calculate the current in the other resistors.

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