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Transcript
Practical Electricity - Formal Homework 2 1 A circuit is set up as shown The current from the supply is 6A. The current in the resistor is 1.5 A. What is the current in, and potential difference across resistor R2 . 2 A circuit is set up as shown Which switch or switches must be closed to light lamp L1 only? 3 (2) (2) A circuit is set up as shown. Work out the reading on each meter. (7) 4. The circuit shown is used to control the brightness of two identical lamps. The variable resistor is adjusted until the lamps operate at their correct voltage of 3.0V (a) (b) (c) (d) (e) When the lamps operate at the correct voltage, the reading on the ammeter is 1.2A. Calculate the current in one lamp. (3) Calculate the resistance of one lamp. (3) Calculate the combined resistance of the two lamps in this circuit. (3) When the lamps operate at their correct voltage the resistance of the variable resistor is 7.5Ω. Calculate the total resistance in the circuit. (3) One of the lamps is removed. (i) What happens to the reading on the ammeter? (1) (ii) Justify your answer. (1) Total (25)
