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We're diving into electric circuits! Our focus: understanding components, their function, and how they connect in series and parallel. Ace your physics exams with us!
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welcome all grade 10's to grade 12's
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class of 2025 physics students to maths
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and science academy in today's video we
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will be focusing on electric circuits in
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the section on electric circuits you
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need to understand the different
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components how they function and how
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they are connected the exam questions
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will in most cases have a circuit
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comprising of a combination of
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components connected in series and or or
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parallel start by identifying which
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resistors are connected in parallel and
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which are connected in series when
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calculating the sum of resistors in
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parallel make sure you do not make the
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mistake of omitting to take the
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reciprocal of the total resistance as 1
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/ total resistance RT equals to 1 / R1 +
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1 / R2 + 1 / R3 plus infinity depending
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on how many resistors are connected in
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parallel for series resistors the total
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resistance as RT equals is equals to R1
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+ R2 + R3 + infinity current so an
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ammeter measures the current in electric
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circuit in ampers a hence the flow of
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charges that pass through it current is
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the rate of flow of charge these simply
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means that the ammeter will measure the
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flow of charge per second the wires
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inside the ammeter must be of negligible
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resistance parallel resistors divide the
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current I proportionally so the bigger
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the resistor the lower the current flow
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the smaller the resistor the bigger the
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current flow that is current in parallel
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resistors is given by the formula total
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current I total equals 2 current in
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amter 1 I1 plus voltage the voltage of a
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battery is measured using the voltmeter
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and the measuring of a voltage is volts
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so a voltmeter measures the voltage in
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an electric circuit in volts a hence the
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flow of charges that pass through it is
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negligible as we previously that current
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is the rate of flow of charge these
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simply means that the voltmeter measures
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the potential difference as the energy
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delivered across each resistor voltmeter
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is constructed in such a way that it has
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a very high resistance so that no
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current or negligible current can flow
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through it voltage in parallel resistors
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is given by the formula total potential
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difference V total equals to voltage in
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voltmeter 1 V1 which is equals to
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voltage in voltmeter 2 which is also
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equals to voltage in voltmeter 3 thus
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voltmeters in parallel have equal
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potential difference throughout
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potential difference in series resistors
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divide the voltage V proportionally so
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the bigger the resistor the lower the
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potential difference the smaller the
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resistor the bigger the potential
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difference that is potential difference
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in series resistors is given by the
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formula total voltage I total equals 2
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voltage in voltmeter 1 V1 plus voltage
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in voltmeter 2 V2 plus voltage in
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voltmeter 3 V3 while series resistors
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have equal potential difference V hence
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as said and shown on the slide
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voltmeters in parallel have equal
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potential difference throughout whereas
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voltmeters in parallel have the total
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potential difference equals to the sum
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of the voltage of each voltmeter
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connected in parallel don't get confused
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this with current emmeters in series
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have equal current throughout whereas
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emters in parallel have the total
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current equals to the sum of the current
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of each emter connected in parallel but
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for potential difference volt leaders in
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parallel have equal potential difference
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[Music]
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