Download Questions on Electricity

Electricity Questions
1) The potential
difference across a
light bulb is 10V.
The charges that
passed the light
bulb were 12C. How
much energy was
transferred?
2) 800C of charge
passed a buzzer in
50 seconds. What is
the current of the
circuit?
3) The voltage of a
resistor is 0.34 volts.
The ammeter on
the circuit reads 17
milliamps. What is
the resistance of
the resistor?
4) The potential
difference across an
LED is 4.2V. The
ammeter on the
circuit reads 0.5A.
What is the power
output of the LED?
5) The power output
of a heater is
300W.The heater
was left on for 2
hours. How much
energy was
transferred?
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6) A motor transferred
20kJ of energy. The
charges that passed
were 250C. What is
the voltage of the
motor?
7) A circuit is
connected to a
resistor. The
current on the
circuit is 2.5A. The
circuit was left
switched on for 3
minutes. How many
charges had passed?
8) The resistance of
the resistor is 6Ω.
What is the
potential difference
across the resistor?
9) The power output
of a microwave is
800W. The voltage
of the microwave is
40V. What is the
current flowing?
10) An electric bell
transferred 900J of
energy in half a
minute. What is the
power output of
the bell?
11) A heating element
has a resistance of
5Ω. The current of
the circuit is 10A.
What is the power
output of the
heating element?
12) A circuit is
connected to a
television. The TV
has a resistance of
1.6Ω. The circuit
has a 9A current
flowing. The TV was
left turned on for
1.25 minutes. How
much energy is
transferred?
Answers
1) 120 J
2) 16 A
3) 20 Ω
4) 2.1 W
5) 2160 kJ
6) 80 V
7) 450 C
8) 15 V
9) 20 A
10) 30 W
11) 500 W
12) 9720 J
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