PLEASE HELP ME WITH THIS! CURRENT ELECTRICITY TEST 74 POINTS
(Show your work and include all units in your answer.)

A resistor is connected to a 40V power supply. An ammeter measures a current of 2.0A going through it. Determine the resistance. [2 marks]

A circuit has a current of 10A. The wire has a resistance of 9Ω. Determine the voltage across the energy source. [2 marks]

The circuit below contains two identical lamps. The total resistance of the circuit is 30Ω. The voltage drop across the battery is 6.0V.

a) Calculate the current in the circuit. [2 marks]
b) Calculate the voltage of each lamp. [2 mark]
c) Calculate the resistance of each lamp. [2 mark]
The circuit below has three identical lamps. The current coming out of the battery is 4A. The total resistance of the circuit is 9Ω.

a) Calculate the voltage of the battery. [2 marks]

b) Calculate the voltage of each lamp. [2 marks]

#10 Draw a schematic diagram of a circuit consisting of a two-cell battery, a resistor, a lamp and a motor all connected in series. Attach a switch to control the circuit, an ammeter to measure the current after the motor and a voltmeter to measure the voltage across the resistor. 10- MARKS

# 11 Draw a schematic diagram of a circuit consisting of a two-cell battery, two motors and two lamps. If one of the lamps is unscrewed the other lamp should also turn off. If one of the motors is disconnected the other one should stay on. Include a switch that controls the whole system, an ammeter to measure the current coming out of the power supply and a voltmeter to measure the voltage drop across the power supply 10 MARKS