Two batteries have each been measured with the following data: E1 = 33.6 V, R1 = 2.2 Ω E2 = 24 V, R2 = 1 Ω The batteries are then connected according to the picture below. Start by writing an equation where the sum of all voltages (ie both the voltages of the sources and the voltage drop across the resistors) is equal to zero. Note! The batteries are oppositely connected, i.e. the currents they drive counteract each other and then E1 and E2 in the equation must be of opposite signs. If you choose the clockwise direction then E1 is positive and E2 is negative. Voltage drops across the resistors are always negative -I(*R1) and -(I*R2). Add up all the voltages in the circuit and equate the sum to zero (Note: the equal sign and the zero are already written, complete the equation with the rest): a) Calculate the current flowing through the circuit. b) Calculate the voltage UAB. c) What is the direction of the current in the circuit:
KVL and KCL
KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.
Sign Convention
Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.
Two batteries have each been measured with the following data: E1 = 33.6 V, R1 = 2.2 Ω E2 = 24 V, R2 = 1 Ω The batteries are then connected according to the picture below. Start by writing an equation where the sum of all voltages (ie both the voltages of the sources and the voltage drop across the resistors) is equal to zero. Note! The batteries are oppositely connected, i.e. the currents they drive counteract each other and then E1 and E2 in the equation must be of opposite signs. If you choose the clockwise direction then E1 is positive and E2 is negative. Voltage drops across the resistors are always negative -I(*R1) and -(I*R2). Add up all the voltages in the circuit and equate the sum to zero (Note: the equal sign and the zero are already written, complete the equation with the rest): a) Calculate the current flowing through the circuit. b) Calculate the voltage UAB. c) What is the direction of the current in the circuit:
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