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In this lesson, we will learn how to use the formula E = QV to find the energy dissipated to the environment by the component of an electronic circuit.
A 7 Ω resistor and a 5 Ω resistor are connected in series to a cell. The cell provides a current of 4 A through the circuit. How much energy do the resistors transfer to the surrounding environment in 20 seconds?
The diagram shows a circuit consisting of three identical resistors connected to a cell. At what rate does one resistor dissipate energy to the surrounding environment?
Which of the following is the correct formula for the energy
transferred to the environment when an amount of a charge,
, is moved across a potential difference,
An electric motor is connected to a 9 V
battery. Over a period of time, the motor converts
450 J of electrical energy into
kinetic energy, heat, and sound. How much charge passes through the motor over this period
Which of the following is the correct formula for the power supplied to a component of an
is the power supplied to the component,
is the current through the
is the potential difference across the component, and
is the resistance of
The diagram shows a circuit consisting of a light bulb connected to a cell. The potential
difference across the bulb is 9 V, and
the current through it is 4 A. How much
is the power of the light bulb?
A 45 mW LED is connected to a 9 V battery and left on for 30 seconds. How much charge passes through the LED over this time?
The potential difference across a resistor in a circuit is
10 V. If 150 C of charge passes
through the resistor, how much energy is dissipated to the environment by the resistor?
A piece of connecting wire in a circuit is
20 cm long. It has a resistance
of 0.02 Ω and dissipates energy to its
environment as heat at a rate of 2 W. How
much is the current passing through the wire?
A 4 A current passes through a 10 Ω resistor. How much is the power of the resistor?
A bulb is connected to a cell in series. The potential difference across the bulb is 4 V and the current through it is 0.1 A.
How much charge passes through the bulb in 60 seconds?
How much energy does the bulb dissipate as light and heat in 60 seconds?
A resistor in a circuit has a potential difference of
12 V across it. It dissipates energy
to its environment in the form of heat at a rate of 48 W. How much charge passes through the
resistor in 2 minutes?
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