A current of 3 A flows through a wire for 4 s. How much charge passes through it?, 7 C, 12 C, 1.3 C, 24 C, Which statement describes conventional current in the external circuit?, From negative to positive, In the same direction as electron flow, From positive to negative, It has no direction, A charge of 150 C passes through a conductor in 50 s. The current is …, 3 A, 0.3 A, 7.5 A, 200 A, One volt is equal to …, one coulomb per joule, one ampere per second, one ohm per coulomb, one joule per coulomb, A source transfers 40 C and does 200 J of work. Its potential difference is …, 8 V, 5 V, 160 V, 0.2 V, Which statement about EMF is correct?, It is measured in ohms, It is the charge passing per second, It is work done by the source per coulomb, It is measured by an ammeter, Two identical 1.5 V cells are connected in series, but one is reversed. The resultant EMF is …, 0 V, 1.5 V, 3.0 V, 4.5 V, A battery contains three identical 1.2 V cells connected in parallel. The resultant EMF is …, 3.6 V, 2.4 V, 1.2 V, 0.4 V, Which arrangement gives a resultant EMF of 6 V using four identical 1.5 V cells?, Four cells in parallel, Two cells in series in each of two parallel branches, All four cells in series, One cell only, When a circuit is closed, the terminal potential difference may be less than the EMF because …, the cells stop supplying energy, some voltage is lost inside the source, the external wires have no resistance, the ammeter uses up voltage, Which change will decrease the resistance of a wire, with material and length unchanged?, Increasing its cross-sectional area, Increasing its temperature (metal wire), Increasing its resistivity, Making it thinner, Two wires have the same length and area. Wire X has greater resistivity than wire Y. Which has greater resistance?, Wire Y, Both have equal resistance, Wire X, Neither has resistance, A wire has resistance 10 Ω. Its length is tripled and its area is also tripled. The new resistance is …, 30 Ω, 10 Ω, 3.3 Ω, 90 Ω, Which statement about resistivity is correct?, It depends only on the wire's length, It is measured in amperes, It is the same as current, It is a property of the material, A resistor is connected to an ohmmeter. Before measuring, the circuit should be …, isolated from the power source, connected to a higher voltage, short-circuited, left operating normally, A rheostat is used in a circuit to …, increase the EMF of the battery, change the resistance and control current, measure potential difference, measure charge, A student moves the rheostat slider to include a shorter resistance wire. The current will …, decrease, stay the same, increase, become alternating, Why is tungsten suitable for an incandescent lamp filament?, It has very low resistivity, It is used because it never heats, It has no electrical resistance, It has a high melting point and can glow when hot, A fuse protects a circuit because it …, melts and breaks the circuit if current is excessive, increases the current, keeps the voltage constant, measures resistance, A lamp is connected to a battery and rheostat in series. The rheostat resistance is increased. Which change is expected?, Current increases and lamp brightens, Current decreases and lamp becomes dimmer, Current stays constant and lamp brightens, The battery EMF doubles

Electric Current - Variation 2

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